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中英励志小故事

2023-07-14 16:34:14
TAG: 故事 励志
共1条回复
snjk

  很多朋友都喜欢找一些来看,下面是我给大家整理的,供大家参阅!

  :三位工匠

  Three craft *** en

  A siege of the city of the enemy, the city residents to get together to discuss mon fight against the enemy"s approach.

  A build Carpenter to e forward to advocate the use of bricks as a resist material; a carpenter decided to propose to the enemy using wood is the best method; a cobbler, stood up and said: "Gentlemen, I do not agree with your views and I think that as resist material, as no better than what Paper. "

  It is said that people are accustomed to from their own point of view, the view that they are familiar with what is the best.

  三个工匠

  一座大城被敌军围困了,城中的居民们聚在一起,共同商议对抗敌人的办法。

  一个砌匠挺身而出,主张用砖块作为抵御材料;一个木匠毅然提议用木头来抗敌是最佳的方法;一个皮匠站起来说:“先生们,我不同意你们的意见。我认为作为抵御材料,没有一样东西比皮更好。”

  这是说,人们都习惯于从自身角度考虑问题,总认为自己所熟悉的东西是最好的。

  :狼和狗

  The Wolf and the Dog

  There is a wolf. He is very hungry and has no strength to find food. As he lies under a large tree, a dog sees him. The dog sees the wolf is so thin and hungry, and he feels sorry for him and says, “You are so terrible! Are you hungry?”

  “Yes,” says the wolf, “I"m hungry because you are guarding the sheep. Now I am so weak that I can"t find food. I think I will do.”

  “Why not help me?” Asks the dog, “I work regularly and I eat regularly. You could do the same. You can help me guard the sleep. In that way, I will not worry about your stealing the sleep, and you will not worry about going hungry. It"s good for us.

  The wolf thinks it over and thinks the dog is right. So they walk to the dog"s house. As they are walking, the wolf sees that only the hair of the dog"s neck is very thin. He is curious about this. So he asks the dog about it.

  “Oh, don"t worry about that,” says the dog, “It"s the place where the collar ties on the neck. My master chains me up at night,”

  “Chained up!” shouts the wolf, “Do you mean that you are chained up at night? If I e to live with you, will I be chained up at night, too?”

  “That"s night,” says the dog, “But, you"ll get used to it.”

  “But, if I am chained up, I won"t be free.” After saying this, the wolf turns round and runs away.

  The dog shouts, “Wait! e back! I"m not free, but I"m healthy. I have good food, and a warm place to sleep. I like enjoying life. In fact, I"m freer than you are.”

  狼和狗

  有一只狼,他非常饿,而且饿得没有力气去找吃的了。当他躺在一棵大树下时,一只狗看见了他。看到狼又饿又瘦,狗挺可怜他的:“你看上去真可怕。你很饿啊?“

  “是的。”狼说,“我饿是因为你和你的伙伴看守着羊群。现在我弱得没法去找食物。我想我就快要死了。”

  “为什么不帮我呢?”狗说,“我们按时工作,准时吃饭。你也行的。你可以帮我看羊群。那样我就不用担心你会来偷羊,你也不用担心挨饿了。这对我们都有好处。”

  狼考虑了一下,觉得狗说的对,他们就一起朝狗的屋子走去了。正走着,狼看见口脖子上的毛很少。他觉得好奇,就问狗怎么回事。

  “啊,别担心,”狗说,“这是系狗项圈的地方,晚上主人会把我拴起来。”

  “拴起来?”狼叫起来,“你是说晚上你会拴起来?如果我去和你住,晚上也会被拴起来?”

  “没错,”狗说,“但是你会习惯的。”

  “但是,如果被拴起来,我就不自由了。”说完,狼转身跑了。

  狗大声喊道:“等等!回来!我是不自由,可是我很健康,我有好的食物,有个温暖的地方睡觉。你太喜欢享受生活了。我其实比你还自由些。”

  :聪明的乌龟

  A Smart Tortoise

  A tiger is hungry, he is looking for food. He sees a frog in front of him.

  “Ha ha! A frog! My dinner!” so he rushes at the frog.

  Behind the tiger, there is a tortoise. The little tortoise sees it; he bites the tiger"s tail.

  “Ouch!” cries the tiger and he looks back. The frog hears the voice and jumps into water.

  “Thank you, little tortoise.” says the frog.

  But the tiger is very angry. “Bother it! I"ll throw you to the sky!”

  “Thank you, I like flying in the sky,” says the tortoise.

  The tiger stops, “I will throw you into the river.”

  “Oh,no! I can"t swim; I will die if you throw me into the water.” The tiger threw the tortoise into the water quickly.

  “Thank you, Mr. Tiger. Bye-bye.” The tortoise and the frog swim away together.

  聪明的乌龟

  一只老虎很饥饿,他正在寻找食物。他看到一只青蛙在他前面。

  “哈哈!一只青蛙,我有晚餐啦!”于是,他补向青蛙。

  在老虎的后边,有一只乌龟。小乌龟看见了,他猛咬一下啊老虎的尾巴。

  “哎呦!”老虎疼得叫起来并回头看看。此时青蛙听见了老虎的声音,他迅速跳进水里。

  “谢谢你,小乌龟。”青蛙说。

  大事老虎十分愤怒:“讨厌!我要把你扔到天上去。”

  “谢谢你,我喜欢在天空飞翔。”乌龟说。

  老虎停下来:“那我就把你扔到到水里。”

  “哦,不!我不会游泳,如果你把我扔井水里我会死的。”老虎很快就把乌龟仍进水了。

  “谢谢你,老虎先生,再见!”乌龟和青蛙一起游走了。

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Years the footsteps of great haste,no time to last year,waved and went to the front of the New Year.New Year always gives a lot of vision,too many of the Imagination.I do not want north wind Yanqu the past,do not want to cover all the winter snows.Over the past number of memories,how many stories,even the pain is a setback,are worth pondering and reflection.But do not want to wallow in the past,under the shackles of old,even if successful,is glory.Because in the past,after all,the past,is in a life time period.New Year is the new starting point,a new beginning.Out of the dull loneliness of siege,the stroll in the fresh nature of space,bathed in the New Year sun and breeze.Look at the mountains after the winter solstice the beginning Fan Qing,thawing river mischievously forward flow into the fields emitting little green head,is New Year"s good news in the report.You will sincerely feel what a happy New Year to all,life is so beautiful.When I stand here today the threshold of the New Year,a solemn,sacred feeling of the heart is for us.The new year will be an unusual year,is worth a lifetime memory for one year.This year there will be a historical event for the number of excited and proud of you,everyone"s life will be opened during the year a new chapter will redouble their efforts to forge ahead.Many of life will be missing in the year to shake up the cause of the failure will be successful in the past year,the family is more healthy and happy during the year,love to live in even more variety this year brilliant.In short,everything,everything,the New Year is a show in front of the Cotai Strip,so you go in life with pride glory.New Year,there are many of the Imagination,everyone will be interpreted with action,so that Imagination into reality.Regardless of turnover year after year,regardless of the cycle of seasons,the New Year will bring you your new beautiful!
2023-07-14 11:37:551

《长津湖》英语作文观后感

【 #英语资源# 导语】最冷的夜,最热的血。最可爱的人们,最坚毅的军魂。时间回拨70余年,那场冰天雪地里的血泪之战,依旧让人不忍回忆。这是永远的伤痛,也是永恒的荣耀。历史不容忘却,英雄必须铭记。即将上映的《长津湖》,复刻了这惊心动魄的一战。但,再高明的电影叙事,终究也说不尽这段史诗的波澜壮阔与沉雄悲壮。 为大家准备了以下内容,供大家参考阅读。 1.《长津湖》英语作文观后感   After watching the film Changjin lake on national day, I have many feelings in my heart.   The battle of Changjin Lake took place on November 27, 1951. At that time, the first Marine Division advanced to the west of Changjin lake, where there were continuous mountains. They did not know that they had been surrounded by 100000 troops.   A battlefield situation map in the film shows the battlefield situation of both sides. Blue is the position and breakthrough route of the first marine division. On the east side of the lake are the 1st and 5th regiments of the 1st Marine Division, with a total of 8000 people. On the south end of the lake are the headquarters of the 1st Marine Division and some engineers, with 3000 people. On the east side of the lake is the 31st regiment of the 7th Army division, serving as right-wing cover, with 4000 people. The total military strength is about 18000.   In addition, the first Marine Division also received air support from the first aviation wing. Red is the other side"s army, forming an encirclement circle. There are three armies of 20j, 27j and 26j of the 9th corps, with a total of 150000 troops finally invested. The light blue in the middle is Changjin lake, which is the reservoir that intercepts the Changjin River, which flows into the Yalu River.   The film "Changjin Lake" reviews the tragic battle from the perspective of veterans, regardless of victory or defeat. The severe cold of minus 40 degrees made the battle more tragic. The living veterans are full of emotion when telling this story. When they left the battlefield, they were no longer hostile. They showed sympathy and respect for the enemy soldiers. 6、 Seventy years later, the young people who loved ice cream are old, but they are still cute.   The commander of the first marine division, as the protagonist, passed by in the film. General Smith is an experienced and cautious commander. The first Marine Division was trapped in a tight encirclement and was not annihilated, largely thanks to his command. The first marine division finally broke through the siege, withdrew all the way to Xingnan port and left by boat. At the same time, more than 90000 North Korean refugees were taken away. The US military suffered 5000 casualties, of which the 31st regiment of the 7th Division accounted for more than 3000. There were tens of thousands of casualties on both sides of the campaign. The first Marine Division was established on February 1, 1941. In the Pacific War, it participated in the battle of gwadanar Island, Gloucester point, beliliu island and Okinawa Island, and made many remarkable achievements in fighting against Japan. After World War II, he participated in the Vietnam War, the Gulf War and the "reconstruction hope" humanitarian relief operation in Somalia.   Except for a few historians, the other explanations in the film are the language of veterans, even if they don"t appear in the picture. They have no hatred in their hearts and will embrace their former opponents. Veterans have their own interpretation of victory and defeat. They feel that although there is no victory, South Korea is still there and worth fighting.   No regrets in this life, not at all! 2.《长津湖》英语作文观后感   I made an appointment with my friend Changjin lake. As a result, she was not free on duty today, so I went by myself.   Before going, I only fished a few napkins in my bag. As a result, I drank a latte before the opening. The whole movie can only wipe tears with sleeves and suck snot silently.   I was most impressed by three scenes: when the train passed the great wall and the morning light shone on the train; The scene of Lei Gong driving; And the scene of the soldiers frozen in the snow at the end of the film.   I have always been a perceptual person. I shed tears when watching the Red Sea and when watching war wolves. I even refused war movies or bitter TV dramas in the cinema for a time. These scenes can"t stop tears.   "Changjin Lake" highlights the group portrait play. Lei Gong"s play is one of the few single plays, and it was also well shot. Many small details have been given to the camera, which is worth watching for the second time. The big scene was very beautiful, especially the ambush. The lens conversion is natural, and the overall completion of the film is very high.   Of course, it is not to say that the film has no shortcomings, because the group image is also a film, so it lacks the fullness of the characters. Some scenes are too dazzling to see clearly, and several dead soldiers did not remember their names. There are many scenes of American soldiers being shot and killed, but few of them are given to our soldiers alone. In fact, we should take more pictures. After all, Chinese soldiers are not made of iron. They will die if they are hit by bullets and artillery fire······   Another feature of the film is that it filmed the daily life of American lower class soldiers, such as posters, songs and food... This probably means that everyone doesn"t want to fight, just want to live a safe and stable life.   Aside from this film, it is really not easy to win the war to resist US aggression and aid Korea. Not all soldiers are the protagonists. They have a flash of inspiration and outstanding throwing skills to survive. They are just flesh and blood. The victory of resisting US aggression and aiding Korea should not be said. It should be said that all the victories in China for independence and peace are paved by the blood donation of people"s heroes. 3.《长津湖》英语作文观后感   "Changjin Lake" focuses on the brothers of wuqianli and wuwanli. It truly restores the passionate history of resisting US aggression and aiding Korea and defending the country more than 70 years ago, which still makes our blood boil.   New China has just been established. Just after a family reunion dinner, a military order once again put on military uniforms and went to the battlefield. When Thanksgiving comes and the US military enjoys delicious food in the camp, the Chinese soldiers can only eat hard potatoes under the cliff; Lei Gong transported the marker bomb for the safety of his comrades in arms, but he sacrificed himself; In order to defend the camp, Yang Gensi picked up the explosive bag and died with the enemy; The unwavering faith of the soldiers of the ice sculpture company made an American officer pay tribute. These soldiers, many of whose names are unknown to us, are heroes.   What is a hero? This is what Wu Wanli, a 19-year-old recruit, once wondered. He felt a little out of reach when he heard that fighting 20 enemies was a hero. Mao anying"s sentence "on the battlefield is a hero" touched me. Countless Chinese volunteers who bravely took the lead on the Korean battlefield fought with the enemy with the light of ideals and beliefs and with the national integrity of protecting the country. They all have such a belief in their hearts: "they don"t believe that there are tasks that can"t be completed, difficulties that can"t be overcome, and enemies that can"t be overcome." every Chinese volunteer who resists US aggression and AIDS Korea, Showing their heroic qualities. Ordinary makes great.   The final victory of the war to resist US aggression and aid Korea is inseparable from these ordinary heroes. They traded their lives for this era without gunsmoke. The 176 minute long "Changjin Lake" is still meaningful after reading.   The great spirit of resisting US aggression and aiding Korea has been renewed for a long time. The great martyrs of the Chinese people"s Volunteer Army will live forever.   Pay tribute to the volunteers who fought for our happiness to resist US aggression and aid Korea. 4.《长津湖》英语作文观后感   The whole film is very shocking. It is based on the historical reality. When bombs fly from the head, they seem to be on the battlefield. In the film, there are brotherhood, friendship and the reluctance of family. The sacrifice of teachers is particularly wonderful every moment. They have exchanged their bodies for our beautiful life now.   Patriotic. These two great but very ordinary words have taken root in the hearts of these soldiers. When the many nameless martyrs died with the enemy with explosive bags in their arms, and when the many nameless heroes froze in the snow, it was the moment when these two simple words developed and expanded in the softest place in their hearts. Patriotism supported their dying bodies, defeated the American ace Legion again and again, and won almost unattainable victories again and again.   They are invincible, they are not afraid; Embellish the blood of life on the great motherland; They always put the motherland first; Overcome the difficulty called "paper tiger". 5.《长津湖》英语作文观后感   After watching the film "Changjin Lake", tears filled my eyes. Tears kept rolling in my eyes, but they didn"t fall. Changjin Lake tells the story of the war to resist US aggression and aid Korea. Most of the soldiers in it are young people.   The war was full of difficulties. Those young volunteers had to climb high snow mountains. The temperature there was as low as minus 30 or 40 degrees. They wore thin clothes and walked dozens of kilometers every day. They don"t have sophisticated weapons, but they want to fight with American planes, artillery and tanks. They can only eat one potato a day and have a few left for the wounded. However, the American soldiers spend Christmas and eat roast chicken in their comfortable and warm position.   I was impressed by a scene in the film:   When the U.S. military charged with dozens of tanks and more than a dozen aircraft, a Chinese soldier Yang Gensi picked up a burning explosive package and rushed to our enemies and died with some of them. He did not hesitate to sacrifice his life in order to complete the task.   Finally, our volunteers defeated the US Army. I want to learn from them the spirit of loving the motherland, not afraid of sacrifice and moving forward bravely. We should also cherish the happy life now, because it is bought with their sacrifice.
2023-07-14 11:38:021

对《石壕吏>这首诗的评析不正确的一项是

4吧。。
2023-07-14 11:39:015

26个英语字母的拼写及发音

a b c d e f g h i g k l m n o p q r s t u v w x y z
2023-07-14 11:39:162

罗马全面战争 自定义战争里面如何修改兵力

打开游戏设置,点击画面设置,高级选项,最大规模!还有就是改钱!
2023-07-14 11:39:264

红色警戒2之尤里复仇怎样修改建筑物

个性化修改器可以改
2023-07-14 11:39:363

一篇贝多芬身残志坚的英文作文。120字左右

贝多芬,作为世界音乐史上最伟大的作曲家,被人们冠以“乐圣”的头衔,并不为过。人们敬仰贝多芬,这不单单是因为他短暂的生命为人类留下了极为丰厚的音乐财富,更多的是他那坚忍不拔,敢于同命运相抗衡的非凡品格所给予我们的十分珍贵的精神财富。Beethoven, world music history as the greatest composer, was dubbed "le holy" people of the title, and much. People look up to Beethoven, and it"s not only because his short life for human left an extremely rich music wealth, more is he that perseverance, dare to compete with the fate of the special character for our very precious spiritual wealth. 贝多芬的命运极其坎坷,甚至可以说“一开始,人生对于他就只是一场悲惨而残暴的战争”。当他还是孩童时,就被父亲剥夺了原本可以尽享欢娱的童年时光,在严酷体罚的压迫下,苦学提琴。然而,痛苦似乎无时无刻不在叩门。在他30岁时耳聋又无情地对他施以酷刑,这对贝多芬内心深处无疑是一个惊天霹雳,造成了难以愈合的创伤,也带来了一个沉重的打击,绝望之际,他几乎好几次寻求自杀。于是,他从内心深处发出惨痛的哀号:“我躲避一切交际,我不能对别人说‘我是聋子"!倘若我干别的职业尚可,但在我的行当里,这是可怕的遭遇。”Beethoven"s fate very bumpy, even "from the beginning, the life he"s just for a miserable and the brutality of war". When he was a child, it was father deprived originally can enjoy all the pleasure of my childhood, in the harsh corporal punishment under the oppression of, laboured at fiddle. However, the pain seems ever-present and knock on the door. In his 30 years old when his deafness and relentless torture, the heart of Beethoven is undoubtedly a blockbuster bang, caused the difficult to heal wounds, but also brings a heavy blow, the despair, he almost several times for suicide. He, then, from inside a bitter wailing: "I evading all communication, I can"t say to others" I was deaf "! If I do nothing, but in my career fair in the business, this is terrible experience." 但与此同时,他又发出另一个坚定有力的声音:“我要扼住命运的喉咙,它决不能让我完全屈服!”这斩钉截铁的不屈誓言,怎能不令人惊服、振作、讴歌呢?究竟是什么力量拯救了这颗趋于毁灭的心?还是让贝多芬自己来回答吧:“在患难中支持我的是道德,使我不曾自杀的,除了艺术以外还是道德!”可见,贝多芬强忍着肉体和精神上的折磨摧残,完全是出于对自己神圣使命的执着追求。他把对音乐的追求,对人类的奉献视为比生命更可贵的灵魂。这是一种力量,一种抗拒生命的不竭动力,永不干涸的生命之泉!But at the same time, he gave another strong voice: "I will take fate by the throat, it can never let me completely yield!" It firmly and unyielding vow, can not a JingFu, cheer up, praise? What is the power to save the planet tend to destroy heart? Or let Beethoven himself to answer it: "in trouble I support the moral, that I never is the suicide, in addition to other than art or moral!" Visible, Beethoven brimming with physical and emotional torture trample upon, is totally out of his holy mission of persist to pursue. He put the music to pursue, to human life as more valuable than dedication of the soul. This is a kind of strength, a resist an inexhaustible source of life, never dry up of the deep springs of life. 贝多芬的耳疾和他创作的大量音乐作品恐怕在许多人眼中仍是一个谜。最难以置信的是,一个聋子是如何创作出如此气势磅礴的《英雄交响乐》?又何以能谱写出豪放宏伟的《命运交响曲》?更是怎样去神话般地弹奏柔和明澈的《月光曲》的?翻阅他大量音乐作品,更令我惊奇的是,他的大部分音乐巨作都是在耳疾之后以靠咬着木杆来感觉音符所完成的。贝多芬从何而来如此非同凡响的灵感,如此丰富的情感和激昂的性格?这一连串的问题在我脑海久久翻腾,无不让人感奋不已,并使我油然想起奥里森·马登的一句名言:“纵观人类历史上的伟大、杰出人物,他们当中一大部分人曾经有过艰辛的童年,甚至备受命运的虐待,但强者总是善于找到生命的支点,及时调整心态,并承受艰难困苦,用恒久的努力去打破重重围困,铸就卓越与伟大。”Beethoven"s ear and a large number of music he creation works in many people"s eyes, I"m afraid is still a mystery. The most incredible is a deaf man is how to create a so ever-roaring "hero symphony"? Why write bold and unconstrained energy spectrum and grand "destiny symphony"? But how to play the downy limpid as myth "moonlight music"? Paging through his great music work, more to my surprise, most of his music masterpiece is in the ear in the woods by bite after feeling in the notes has done. Beethoven come from so outstanding and brilliant inspiration, so rich emotions and feelings of the personality? This a series of problems in my mind tossing long, without exception, let a person feel exerts, and make me think of Mr Queen allison · madden maxim: "throughout human history, the great outstanding people, among them a most people had hard childhood, even the fate of abuse, but has the strong always are good at finding the fulcrum of the life, adjust mentality, and bear hardships, with constant was to break the siege, mold excellent and great." 1827年3月26日下午5时40分,在狂风暴雨中,贝多芬结束了他57年的人生旅程,孤独地死去了。死时拳头紧握,或许在最后的时刻,他仍然要扼住命运的喉咙。
2023-07-14 11:39:451

“石壕吏”的翻译?

分类: 文化/艺术 >> 文学 >> 小说 解析: 《石壕吏》原文 暮投石壕村,有吏夜捉人。老翁逾墙走,老妇出门看。 史呼一何怒! 妇啼一何苦! 听妇前致词:三男邺城戍。一男附书至,二男新战死。存者且偷生,死者长已矣! 室中更无人,惟有乳下孙。有孙母未去,出入无完裙。老妪力虽衰.请从吏夜归。急应河阳役,犹得备晨炊。夜久语声绝,如闻泣幽咽。天明登前途,独与老翁别。 《石壕吏》译文 傍晚投宿于石壕村,在夜里有官吏来捉人。老翁翻墙逃走,老妇走出去应对。 官吏喊叫的声音是那样凶,老妇啼哭的情形是那样凄苦。 我听到老妇上前说:“我三个儿子都服役去参加围困邺城之战。其中一个儿子托人捎了信回来,其中两个最近刚战死了。活着的人暂且偷生,死的人永远逝去。家中再也没有什么人丁了,只有个吃乳的小孙子。因为有小孙子,所以儿媳妇没有离开这个家,但进进出出没有一条完好的裙子。老妇我虽然身体衰弱,请允许我跟丛您夜归。 赶紧应付河阳需要的劳役,现在还赶得上做早炊。” 入夜说话的声音也已经消失了,但好像听到低声哭泣抽咽。 天亮后我继续赶前面的路程,只能与逃走回来的老翁告别。 "Shi Hao Government official" original text The evening throws Shi Haocun, has the government official night to seize the human. The old man exceed wall walks, the old woman goes out looked. The history shouts a He Nu! Why bother does the woman cry one! Listens to in front of the woman to deliver a speech: Three male Ye Chengshu. One male attaches the book to, o male died in battle newly. Saving also drags out an ignoble existence, the dead long are over! In the room nobody, only has under the breast the grandson. Has the grandson mother not to go, the difference does not have the skirt. The old woman strength although fades. please turns over to from the government official night. Should the Heyang service, still prepare the early morning anxiously to cook a meal. The night of long sound of talking certainly, like heard sobs sobs. The day Minden future, alone leaves with the old man. "Shi Hao Government official" translation Evening seeks lodging for the night Yu Shihao the village, has the government official in the night to seize the human. The old man turns the wall to run away, the old woman goes out should be right. The government official yells the sound is such ominous, the old woman cries aloud the situation is such 凄苦. I hear the old woman to go forward to say that, □my three sons all serve participate siege war of the Ye city. Son asked the human to bring a letter, o just died in battle recently. Is living the human drags out an ignoble existence for the time being, the human which dies forever passes. In the family also did not have what person again, only then ate the breast little grandson. Because has the little grandson, therefore the daughter-in-law has not left this family, but does not pass in and out a plete skirt. Old woman I although the body is feeble, please allow me to turn over to with the clump of your night. Hurries service which deals with Heyang to need, now also catches up with on does early cooks a meal. □ At nightfall speaks the sound already has also vanished, but resembles hears sobs in a low voice sobs. Front the dawn I continue to catch up with the distance, only can with the old man farewell which runs away.
2023-07-14 11:39:521

用英文翻译中国历史故事

你有故事去金山词霸翻译就可以了!
2023-07-14 11:40:135

怎么开启浏览器中的JavaScript功能

浏览器本来就是支持js的,默认为开启状态。
2023-07-14 11:36:293

抖音来客客服电话多少?

抖音来客客服电话24小时人工服务热线95152。有些用户在使用抖音的时候遇到了一些问题,需要咨询人工客服可以拨打95152。客服的上班是有时间的,客服的时间通常是周一到周日,早上九点到晚上的19点,如果有问题,最好在这个时间段找抖音客服解决,这样也能提升问题解决的效率。如果商家不想通过抖音商店客户服务电话24小时手动服务热线解决问题,可以打开抖音,在个人信息页面右上角,点击三点图标,找到抖音手动客户服务,直接点击设置,在抖音设置界面中,选择抖音,点击下面的非法和不良信息报告电话,系统将自动拨打抖音手动客户服务电话。抖音来客的优势:抖音来客受到了商家及外界的持续关注。它是面向生活服务商家的经营平台,商家可以在这里发布门店认领、团购商品上架管理、营销推广、核销提现、经营数据分析等操作,实现线上线下交易链路打通。增加了子账号能力,实现多角色经营,提升经营效率,目前仅能通过电脑版操作。还增加了支持分门店独立收款和开票新增评价管理功能。
2023-07-14 11:36:311

"不好意思,人都没了,照片也不在了"这句话用法语怎么说

Désolé ,il a disparu ,et les photos ne sont plus là .
2023-07-14 11:36:313

数学LOGaN的定义

这是对数的表达形式,对数和指数函数互为反函数。了解反函数的概念吗?指数函数是y=a^x,a是底数,x是次数。而logaN的值就是上面这个指数函数的次数,也就是x。N相当于指数函数里的y。 LOGaN表示以a为底数,a的多少次幂的值为N,要就这个次数。比如指数函数y=2^5,2是底数,5是次数,这个y值可以算出y=2^5=32,要你求LOGaN的值,这里a=2,N=32,带进去log的函数值就是5。应该清楚了吧。希望采纳
2023-07-14 11:36:321

赤藓糖醇的功效与作用 赤藓糖醇代替糖的危害

1 赤藓糖醇的功效与作用 1、抗氧化 赤藓糖醇具有抗氧化活性,可作为一种抗氧化剂,在体内有助于防止高血糖引起的血管损伤,还可有效清除自由基,有益于皮肤健康,延缓衰老。 2、增加食物甜度 赤藓糖醇是一种甜味剂,甜度是蔗糖的60%-70%,入口有清凉的甜味,一般加入蛋糕、糖果、饮料等食品中使用。 3、帮助减肥 赤藓糖醇虽然甜,但是没有热量,是天然零热量的甜味剂,对于蛋糕类产品,添加赤藓糖醇可以至少减少30%的热量,并且使用后不会带来负面的影响,吃后可帮助减肥,非常适合想要瘦身的人群替代糖食用。 4、保护口腔 很多人吃糖担心会龋齿,而赤藓糖醇这种代糖不会被口腔细菌所利用,因此不会造成牙齿损伤,还能减少口腔细菌滋生,有效保护口腔健康。 5、改善异味 赤藓糖醇可以促进乙醇分子和水分子的溶液结合,酒精类饮料可减少气味和酒精的感官刺激,可有效提高白酒和葡萄酒的质量,同时赤藓糖醇还可以明显改善植物提取物、胶原蛋白、肽类等物质的不良异味,目前已有部分胶原蛋白类的产品配方中添加赤藓糖醇来改善口感。 2 赤藓糖醇升血糖吗 不升血糖。 赤藓糖醇的血糖指数和胰岛素指数分别为0、2,人体内没有代谢赤藓糖醇的酶系,赤藓糖醇进入人体后不参与代谢,大部份随尿液排出体外,因此几乎不产生热量和引起血糖变化,它也不像其他糖醇对胰岛素的分泌发生作用,对胆固醇,甘油三酯等生理指标也无影响,因此非常适合糖尿病人和减肥人群食用。 3 赤藓糖醇代替糖的危害 正常人适量食用赤藓糖醇几乎没有危害,但需注意以下几点: 1、对糖甜度需求更高,长期吃赤藓糖醇来替代糖,容易对甜度需求越来越高,吃的更甜。 2、摄入这种赤藓糖醇做的代糖食品,由于不能为人体提供热量,容易产生更强的饥饿感,总感觉吃不饱,从而摄入其他高热量食物,反而容易长胖,不利于减肥。 3、部分患肠易激综合征或其他消化疾病的人食用赤藓糖醇有可能导致肠胃不适。 4 哪些人不能吃赤藓糖醇 服用后有不适的人。 所有的糖醇吃多了都会腹泻,但腹泻和自身耐受量密切相关,如食用其它糖醇稍微多吃一些就会腹泻,而赤藓糖醇在人体耐受量是最高的,不易出现腹泻,但不排除个别人吃后有身体不适的现象,尤其是平时易过敏人群、胃肠道疾病患者这类人建议不吃为好,以免对健康不利。 除此之外,赤藓糖醇是天然零热量的甜味剂,不能被口腔细菌利用,不引起龋齿,非常适合喜欢吃甜食怕长胖、需要控制血糖等人群食用,每天摄入大约10-15g糖醇是相对安全的,必要时可咨询医生、相关专业人士的建议。
2023-07-14 11:36:351

上海交大技术转移硕士(MTT)项目是什么?

上海交通大学积极对接国家和行业需要,开展科技成果转化专项改革试点,依托雄厚的学科优势和人才培养实力,开设技术转移硕士(MTT)项目。上海交通大学于2021年10月获批全国首个“技术转移专业硕士学位点”(Master of Technology Transfer,简称MTT),由中银科技金融学院依托安泰经济与管理学院开展培养工作。技术转移专业硕士设置技术战略规划与科创融资两大方向,主要面向集成电路、生物医药、人工智能、电子信息、生命健康、汽车、高端装备、先进材料等国家发展关键行业,填补上述行业紧缺人才缺口。
2023-07-14 11:36:361

z00n的音标是什么?

英文原文:zoon英式音标:[zuu02d0n] 美式音标:[zun]
2023-07-14 11:36:401

怎样算对数什么是对数

怎样算对数什么是对数 1对数的概念 如果a(a>0,且a≠1)的b次幂等于N,即ab=N,那么数b叫做以a为底N的对数,记作:logaN=b,其中a叫做对数的底数,N叫做真数. 由定义知: ①负数和零没有对数; ②a>0且a≠1,N>0; ③loga1=0,logaa=1,alogaN=N,logaab=b. 特别地,以10为底的对数叫常用对数,记作log10N,简记为lgN;以无理数e(e=2.718 28…)为底的对数叫做自然对数,记作logeN,简记为lnN. 2对数式与指数式的互化 式子名称abN指数式ab=N(底数)(指数)(幂值)对数式logaN=b(底数)(对数)(真数) 3对数的运算性质 如果a>0,a≠1,M>0,N>0,那么 (1)loga(MN)=logaM+logaN. (2)logaMN=logaM-logaN. (3)logaMn=nlogaM (n∈R). 问:①公式中为什么要加条件a>0,a≠1,M>0,N>0? ②logaan=? (n∈R) ③对数式与指数式的比较.(学生填表) 式子ab=NlogaN=b名称a—幂的底数 b— N—a—对数的底数 b— N—运 算 性 质am·an=am+n am÷an= (am)n= (a>0且a≠1,n∈R)logaMN=logaM+logaN logaMN= logaMn=(n∈R) (a>0,a≠1,M>0,N>0) 难点疑点突破 对数定义中,为什么要规定a>0,,且a≠1? 理由如下: ①若a<0,则N的某些值不存在,例如log-28? ②若a=0,则N≠0时b不存在;N=0时b不惟一,可以为任何正数? ③若a=1时,则N≠1时b不存在;N=1时b也不惟一,可以为任何正数? 为了避免上述各种情况,所以规定对数式的底是一个不等于1的正数? 解题方法技巧 1 (1)将下列指数式写成对数式: ①54=625;②2-6=164;③3x=27;④13m=5?73. (2)将下列对数式写成指数式: ①log1216=-4;②log2128=7; ③log327=x;④lg0.01=-2; ⑤ln10=2.303;⑥lgπ=k. 解析由对数定义:ab=N?logaN=b. 解答(1)①log5625=4.②log2164=-6. ③log327=x.④log135.73=m. 解题方法 指数式与对数式的互化,必须并且只需紧紧抓住对数的定义:ab=N?logaN=b.(2)①12-4=16.②27=128.③3x=27. ④10-2=0.01.⑤e2.303=10.⑥10k=π. 2 根据下列条件分别求x的值: (1)log8x=-23;(2)log2(log5x)=0; (3)logx27=31+log32;(4)logx(2+3)=-1. 解析(1)对数式化指数式,得:x=8-23=? (2)log5x=20=1. x=? (3)31+log32=3×3log32=?27=x? (4)2+3=x-1=1x. x=? 解答(1)x=8-23=(23)-23=2-2=14. (2)log5x=20=1,x=51=5. (3)logx27=3×3log32=3×2=6, ∴x6=27=33=(3)6,故x=3. (4)2+3=x-1=1x,∴x=12+3=2-3. 解题技巧 ①转化的思想是一个重要的数学思想,对数式与指数式有着密切的关系,在解决有关问题时,经常进行着两种形式的相互转化. ②熟练应用公式:loga1=0,logaa=1,alogaM=M,logaan=n.3 已知logax=4,logay=5,求A=〔x·3x-1y2〕12的值. 解析思路一,已知对数式的值,要求指数式的值,可将对数式转化为指数式,再利用指数式的运算求值; 思路二,对指数式的两边取同底的对数,再利用对数式的运算求值? 解答解法一∵logax=4,logay=5, ∴x=a4,y=a5, ∴A=x512y-13=(a4)512(a5)-13=a53·a-53=a0=1. 解法二对所求指数式两边取以a为底的对数得 logaA=loga(x512y-13) =512logax-13logay=512×4-13×5=0, ∴A=1. 解题技巧 有时对数运算比指数运算来得方便,因此以指数形式出现的式子,可利用取对数的方法,把指数运算转化为对数运算.4 设x,y均为正数,且x·y1+lgx=1(x≠110),求lg(xy)的取值范围. 解析一个等式中含两个变量x、y,对每一个确定的正数x由等式都有惟一的正数y与之对应,故y是x的函数,从而lg(xy)也是x的函数.因此求lg(xy)的取值范围实际上是一个求函数值域的问题,怎样才能建立这种函数关系呢?能否对已知的等式两边也取对数? 解答∵x>0,y>0,x·y1+lgx=1, 两边取对数得:lgx+(1+lgx)lgy=0. 即lgy=-lgx1+lgx(x≠110,lgx≠-1). 令lgx=t, 则lgy=-t1+t(t≠-1). ∴lg(xy)=lgx+lgy=t-t1+t=t21+t. 解题规律 对一个等式两边取对数是解决含有指数式和对数式问题的常用的有效方法;而变量替换可把较复杂问题转化为较简单的问题.设S=t21+t,得关于t的方程t2-St-S=0有实数解. ∴Δ=S2+4S≥0,解得S≤-4或S≥0, 故lg(xy)的取值范围是(-∞,-4〕∪〔0,+∞). 5 求值: (1)lg25+lg2·lg50+(lg2)2; (2)2log32-log3329+log38-52log53; (3)设lga+lgb=2lg(a-2b),求log2a-log2b的值; (4)求7lg20·12lg0.7的值. 解析(1)25=52,50=5×10.都化成lg2与lg5的关系式. (2)转化为log32的关系式. (3)所求log2a-log2b=log2ab由已知等式给出了a,b之间的关系,能否从中求出ab的值呢? (4)7lg20·12lg0.7是两个指数幂的乘积,且指数含常用对数, 设x=7lg20·12lg0.7能否先求出lgx,再求x? 解答(1)原式=lg52+lg2·lg(10×5)+(lg2)2 =2lg5+lg2·(1+lg5)+(lg2)2 =lg5·(2+lg2)+lg2+(lg2)2 =lg102·(2+lg2)+lg2+(lg2)2 =(1-lg2)(2+lg2)+lg2+(lg2)2 =2-lg2-(lg2)2+lg2+(lg2)2=2. (2)原式=2log32-(log325-log332)+log323-5log59 =2log32-5log32+2+3log32-9 =-7. (3)由已知lgab=lg(a-2b)2 (a-2b>0), ∴ab=(a-2b)2, 即a2-5ab+4b2=0. ∴ab=1或ab=4,这里a>0,b>0. 若ab=1,则a-2b<0, ∴ab=1( 舍去). ∴ab=4, ∴log2a-log2b=log2ab=log24=2. (4)设x=7lg20·12lg0.7,则 lgx=lg20×lg7+lg0.7×lg12 =(1+lg2)·lg7+(lg7-1)·(-lg2) =lg7+lg2=14, ∴x=14, 故原式=14. 解题规律 ①对数的运算法则是进行同底的对数运算的依据,对数的运算法则是等式两边都有意义的恒等式,运用法则进行对数变形时要注意对数的真数的范围是否改变,为防止增根所以需要检验,如(3). ②对一个式子先求它的常用对数值,再求原式的值是代数运算中常用的方法,如(4).6 证明(1)logaN=logcNlogca(a>0,a≠1,c>0,c≠1,N>0); (2)logab·logbc=logac; (3)logab=1logba(b>0,b≠1); (4)loganbm=mnlogab. 解析(1)设logaN=b得ab=N,两边取以c为底的对数求出b就可能得证. (2)中logbc能否也换成以a为底的对数. (3)应用(1)将logab换成以b为底的对数. (4)应用(1)将loganbm换成以a为底的对数. 解答(1)设logaN=b,则ab=N,两边取以c为底的对数得:b·logca=logcN, ∴b=logcNlogca.∴logaN=logcNlogca. (2)由(1)logbc=logaclogab. 所以 logab·logbc=logab·logaclogab=logac. (3)由(1)logab=logbblogba=1logba. 解题规律 (1)中logaN=logcNlogca叫做对数换底公式,(2)(3)(4)是(1)的推论,它们在对数运算和含对数的等式证明中经常应用. 对于对数的换底公式,既要善于正用,也要善于逆用.(4)由(1)loganbm=logabmlogaan=mlogabnlogaa= mnlogab. 7 已知log67=a,3b=4,求log127. 解析依题意a,b是常数,求log127就是要用a,b表示log127,又3b=4即log34=b,能否将log127转化为以6为底的对数,进而转化为以3为底呢? 解答已知log67=a,log34=b, ∴log127=log67log612=a1+log62. 又log62=log32log36=log321+log32, 由log34=b,得2log32=b. ∴log32=b2,∴log62=b21+b2=b2+b. ∴log127=a1+b2+b=a(2+b)2+2b. 解题技巧 利用已知条件求对数的值,一般运用换底公式和对数运算法则,把对数用已知条件表示出来,这是常用的方法技巧?8 已知x,y,z∈R+,且3x=4y=6z. (1)求满足2x=py的p值; (2)求与p最接近的整数值; (3)求证:12y=1z-1x. 解析已知条件中给出了指数幂的连等式,能否引进中间量m,再用m分别表示x,y,z?又想,对于指数式能否用对数的方法去解答? 解答(1)解法一3x=4y?log33x=log34y?x=ylog34?2x=2ylog34=ylog316, ∴p=log316. 解法二设3x=4y=m,取对数得: x·lg3=lgm,ylg4=lgm, ∴x=lgmlg3,y=lgmlg4,2x=2lgmlg3,py=plgmlg4. 由2y=py, 得 2lgmlg3=plgmlg4, ∴p=2lg4lg3=lg42lg3=log316. (2)∵2=log39<log316<log327=3, ∴2<p<3. 又3-p=log327-log316=log32716, p-2=log316-log39=log3169, 而2716<169, ∴log32716<log3169,∴p-2>3-p. ∴与p最接近的整数是3. 解题思想 ①提倡一题多解.不同的思路,不同的方法,应用了不同的知识或者是相同知识的灵活运用,既发散了思维,又提高了分析问题和解决问题的能力,何乐而不为呢? ②(2)中涉及比较两个对数的大小.这是同底的两个对数比大小.因为底3>1,所以真数大的对数就大,问题转化为比较两个真数的大小,这里超前应用了对数函数的单调性,以鼓励学生超前学习,自觉学习的学习积极性.(3)解法一令3x=4y=6z=m,由于x,y,z∈R+, ∴k>1,则 x=lgmlg3,y=lgmlg4,z=lgmlg6, 所以1z-1x=lg6lgm-lg3lgm=lg6-lg3lgm=lg2lgm,12y=12·lg4lgm=lg2lgm, 故12y=1z-1x. 解法二3x=4y=6z=m, 则有3=m1x①,4=m1y②,6=m1z③, ③÷①,得m1z-1x=63=2=m12y. ∴1z-1x=12y. 9 已知正数a,b满足a2+b2=7ab.求证:logma+b3=12(logma+logmb)(m>0且m≠1). 解析已知a>0,b>0,a2+b2=7ab.求证式中真数都只含a,b的一次式,想:能否将真数中的一次式也转化为二次,进而应用a2+b2=7ab? 解答logma+b3=logm(a+b3)212= 解题技巧 ①将a+b3向二次转化以利于应用a2+b2=7ab是技巧之一. ②应用a2+b2=7ab将真数的和式转化为ab的乘积式,以便于应用对数运算性质是技巧之二.12logma+b32=12logma2+b2+2ab9. ∵a2+b2=7ab, ∴logma+b3=12logm7ab+2ab9=12logmab=12(logma+logmb), 即logma+b3=12(logma+logmb). 思维拓展发散 1 数学兴趣小组专门研究了科学记数法与常用对数间的关系.设真数N=a×10n.其中N>0,1≤a<10,n∈Z.这就是用科学记数法表示真数N.其科学性体现在哪里?我们只要研究数N的常用对数,就能揭示其中的奥秘. 解析由已知,对N=a×10n取常用对数得,lgN=n+lga.真数与对数有何联系? 解答lgN=lg(a×10n)=n+lga.n∈Z,1≤a<10, ∴lga∈〔0,1). 我们把整数n叫做N的常用对数的首数,把lga叫做N的常用对数的尾数,它是正的纯小数或0. 小结:①lgN的首数就是N中10n的指数,尾数就是lga,0≤lga<1; ②有效数字相同的不同正数它们的常用对数的尾数相同,只是首数不同; ③当N≥1时,lgN的首数n比它的整数位数少1,当N∈(0,1)时,lgN的首数n是负整数,|n|-1与N的小数点后第一个不是0的有效数字前的零的个数相同. 师生互动 什么叫做科学记数法? N>0,lgN的首数和尾数与a×10n有什么联系? 有效数字相同的不同正数其常用对数的什么相同?什么不同? 2 若lgx的首数比lg1x的首数大9,lgx的尾数比lg1x的尾数小0?380 4,且lg0.203 4=1.308 3,求lgx,x,lg1x的值. 解析①lg0.203 4=1?308 3,即lg0.203 4=1+0.308 3,1是对数的首数,0.308 3是对数的尾数,是正的纯小数;②若设lgx=n+lga,则lg1x也可表出. 解答设lgx=n+lga,依题意lg1x=(n-9)+(lga+0.380 4). 又lg1x=-lgx=-(n+lga), ∴(n-9)+(lga+0?380 4)=-n-lga,其中n-9是首数,lga+0?380 4是尾数,-n-lga=-(n+1)+(1-lga),-(n+1)是首数1-lga是尾数,所以: n-9=-(n+1) lga+0.380 4=1-lga?n=4, lga=0.308 3. ∴lgx=4+0.308 3=4.308 3, ∵lg0.203 4=1.308 3,∴x=2.034×104. ∴lg1x=-(4+0.308 3)=5.691 7. 什么是对数及对数坐标 :define.ki./WebForms/WebDefines.aspx?searchword=%E5%AF%B9%E6%95%B0%E5%9D%90%E6%A0%87 什么是对数 对数的定义: 1.如果 a^x=N(a>0,且a≠1),那么数x叫做以a为底N的对数(logarithm),记作 x=logaN .其中,a叫做对数的底数,N叫做真数。且a>o,a≠1,N>0 2.特别地,我们称以10为底的对数叫做常用对数(mon logarithm),并把log10N 记为 lgN. 3.称以无理数e(e=2.71828...)为底的对数称为自然对数(natural logarithm),并把logeN 记为 lnN. 零没有对数.[1]在实数范围内,负数无对数。在复数范围内,负数有对数。 如:㏑(-5)=㏑[(-1)*5]=㏑(-1)+㏑5=iπ+㏑5. 而事实上,当θ=(2k+1)π时(k∈Z),e^[(2k+1)πi]+1=0,这样,㏑(-1)的具有周期性的多个值,㏑(-1)=(2k+1)πi。这样,任意一个负数的自然对数都具有周期性的多个值。 例如:㏑(-5)=(2k+1)πi+㏑5。 loga1=0,logaa=1 [1]::pep../gzsx/jszx_1/czsxtbjxzy/xkbsyjc/dzkb/bx1/201102/t20110217_1021396.htm 对数的概念: 如果b^nx,则记n=log(b)(x)。其中,b叫做“底数”,x叫做“真数”,n叫做“以b为底的x的对数”。 log(b)(x)函数中x的定义域是x>0,零和负数没有对数;b的定义域是b>0且b≠1 对数的历史: 对数是中学初等数学中的重要内容,那么当初是谁首创“对数”这种高级运算的呢?在数学史上,一般认为对数的发明者是十六世纪末到十七世纪初的苏格兰数学家——纳皮尔(Napier,1550-1617年)男爵。在纳皮尔所处的年代,哥白尼的“太阳中心说”刚刚开始流行,这导致天文学成为当时的热门学科。可是由于当时常量数学的局限性,天文学家们不得不花费很大的精力去计算那些繁杂的“天文数字”,因此浪费了若干年甚至毕生的宝贵时间。纳皮尔也是当时的一位天文爱好者,为了简化计算,他多年潜心研究大数字的计算技术,终于独立发明了对数。当然,纳皮尔所发明的对数,在形式上与现代数学中的对数理论并不完全一样。在纳皮尔那个时代,“指数”这个概念还尚未形成,因此纳皮尔并不是像现行代数课本中那样,通过指数来引出对数,而是通过研究直线运动得出对数概念的。那么,当时纳皮尔所发明的对数运算,是怎么一回事呢?在那个时代,计算多位数之间的乘积,还是十分复杂的运算,因此纳皮尔首先发明了一种计算特殊多位数之间乘积的方法。让我们来看看下面这个例子: 0、1、2、3、4、5、6、7 、8 、9 、10 、11 、12 、13 、14 、…… 1、2、4、8、16、32、64、128、256、512、1024、2048、4096、8192、16384、…… 这两行数字之间的关系是极为明确的:第一行表示2的指数,第二行表示2的对应幂。如果我们要计算第二行中两个数的乘积,可以通过第一行对应数字的加和来实现。比如,计算64×256的值,就可以先查询第一行的对应数字:64对应6,256对应8;然后再把第一行中的对应数字加和起来:6+8=14;第一行中的14,对应第二行中的16384,所以有:64×256=16384。纳皮尔的这种计算方法,实际上已经完全是现代数学中“对数运算”的思想了。回忆一下,我们在中学学习“运用对数简化计算”的时候,采用的不正是这种思路吗:计算两个复杂数的乘积,先查《常用对数表》,找到这两个复杂数的常用对数,再把这两个常用对数值相加,再通过《常用对数的反对数表》查出加和值的反对数值,就是原先那两个复杂数的乘积了。这种“化乘除为加减”,从而达到简化计算的思路,不正是对数运算的明显特征吗?经过多年的探索,纳皮尔男爵于1614年出版了他的名著《奇妙的对数定律说明书》,向世人公布了他的这项发明,并且解释了这项发明的特点。所以,纳皮尔是当之无愧的“对数缔造者”,理应在数学史上享有这份殊荣。伟大的导师恩格斯在他的著作《自然辩证法》中,曾经把笛卡尔的坐标、纳皮尔的对数、牛顿和莱布尼兹的微积分共同称为十七世纪的三大数学发明。法国著名的数学家、天文学家拉普拉斯(PierreSimonLaplace,1749-1827)曾说对数可以缩短计算时间,“在实效上等于把天文学家的寿命延长了许多倍”。 对数的性质及推导 用^表示乘方,用log(a)(b)表示以a为底,b的对数 *表示乘号,/表示除号 定义式: 若a^n=b(a>0且a≠1) 则n=log(a)(b) 基本性质: 1.a^(log(a)(b))=b 2.log(a)(MN)=log(a)(M)+log(a)(N); 3.log(a)(M/N)=log(a)(M)-log(a)(N); 4.log(a)(M^n)=nlog(a)(M) 推导 1.这个就不用推了吧,直接由定义式可得(把定义式中的[n=log(a)(b)]带入a^n=b) 2. MN=M*N 由基本性质1(换掉M和N) a^[log(a)(MN)] = a^[log(a)(M)] * a^[log(a)(N)] 由指数的性质 a^[log(a)(MN)] = a^{[log(a)(M)] + [log(a)(N)]} 又因为指数函数是单调函数,所以 log(a)(MN) = log(a)(M) + log(a)(N) 3.与2类似处理 MN=M/N 由基本性质1(换掉M和N) a^[log(a)(M/N)] = a^[log(a)(M)] / a^[log(a)(N)] 由指数的性质 a^[log(a)(M/N)] = a^{[log(a)(M)] - [log(a)(N)]} 又因为指数函数是单调函数,所以 log(a)(M/N) = log(a)(M) - log(a)(N) 4.与2类似处理 M^n=M^n 由基本性质1(换掉M) a^[log(a)(M^n)] = {a^[log(a)(M)]}^n 由指数的性质 a^[log(a)(M^n)] = a^{[log(a)(M)]*n} 又因为指数函数是单调函数,所以 log(a)(M^n)=nlog(a)(M) 其他性质: 性质一:换底公式 log(a)(N)=log(b)(N) / log(b)(a) 推导如下 N = a^[log(a)(N)] a = b^[log(b)(a)] 综合两式可得 N = {b^[log(b)(a)]}^[log(a)(N)] = b^{[log(a)(N)]*[log(b)(a)]} 又因为N=b^[log(b)(N)] 所以 b^[log(b)(N)] = b^{[log(a)(N)]*[log(b)(a)]} 所以 log(b)(N) = [log(a)(N)]*[log(b)(a)] {这步不明白或有疑问看上面的} 所以log(a)(N)=log(b)(N) / log(b)(a) 性质二:(不知道什么名字) log(a^n)(b^m)=m/n*[log(a)(b)] 推导如下 由换底公式[lnx是log(e)(x),e称作自然对数的底] log(a^n)(b^m)=ln(a^n) / ln(b^n) 由基本性质4可得 log(a^n)(b^m) = [n*ln(a)] / [m*ln(b)] = (m/n)*{[ln(a)] / [ln(b)]} 再由换底公式 log(a^n)(b^m)=m/n*[log(a)(b)] --------------------------------------------(性质及推导 完 ) 公式三: log(a)(b)=1/log(b)(a) 证明如下: 由换底公式 log(a)(b)=log(b)(b)/log(b)(a) ----取以b为底的对数,log(b)(b)=1 =1/log(b)(a) 还可变形得: log(a)(b)*log(b)(a)=1 对数,是一个数学名词,也是一种数学方法! 在数学中,对数是对求幂的逆运算,正如除法是乘法的倒数,反之亦然。 这意味着一个数字的对数是必须产生另一个固定数字(基数)的指数。 在简单的情况下,乘数中的对数计数因子。更一般来说,乘幂允许将任何正实数提高到任何实际功率,总是产生正的结果,因此可以对于b不等于1的任何两个正实数b和x计算对数。 如果a的x次方等于N(a>0,且a不等于1),那么数x叫做以a为底N的对数(logarithm),记作x=logaN。其中,a叫做对数的底数,N叫做真数。 如果 a^x=N(a>0,且a≠1),那么数x叫做以a为底N的对数,记作 x=log(a) N .其中,a叫做对数的底数,N叫做真数。且a>o,a≠1,N>0 2的3次方=8,5的多少次方=625呢,答案是4,像这种求某数的x次方等于另一个数(即已知a,b,求a的多少次方等于b)的就是对数 是一种函数
2023-07-14 11:36:421

抖音来客团购怎么提现

抖音来客团购怎么提现的步骤如下:1、在抖音来客APP左下角单击首页;2、在门店经营右侧单击更多;3、在当前页面找到并单击提现进行操作即可。
2023-07-14 11:36:241

MTT法的介绍

MTT法又称MTT比色法,是一种检测细胞存活和生长的方法。其检测原理为活细胞线粒体中的琥珀酸脱氢酶能使外源性MTT还原为水不溶性的蓝紫色结晶甲瓒(Formazan)并沉积在细胞中,而死细胞无此功能。二甲基亚砜(DMSO)能溶解细胞中的甲瓒,用酶联免疫检测仪在540 或720nm波长处测定其光吸收值,可间接反映活细胞数量。在一定细胞数范围内,MTT结晶形成的量与细胞数成正比。该方法已广泛用于一些生物活性因子的活性检测、大规模的抗肿瘤药物筛选、细胞毒性试验以及肿瘤放射敏感性测定等。它的特点是灵敏度高、经济。
2023-07-14 11:36:231

ANSYS建模导入flac3d ,部分单元提示zoon at line has poor 是什么原因?

要划分网格,肯定就已经在ansys里赋予了材料属性了,所以接触问题也应该在ansys解决,至于ansys里的接触单元很多,看你选择哪个单元才满足你需要的接触问题,弹簧单元应该就够用了,个人意见!
2023-07-14 11:36:211

如何激活LabVIEW Scripting高级功能

LabVIEWScripting的高级功能(比如创建新的VI,修改VI程序框图上的程序等)是需要特殊授权的。从2009年8月开始,NI公司将这一授权公开给了所有LabVIEW用户。也就是任何一个LabVIEW用户都可以免费申请获得LabVIEWScripting的高级功能的使用授权。 取得授权并激活这一功能的方法是:首先打开 LabVIEW Scripting 的网页,网址(http://decibel.ni.com/content/docs/DOC-4973),下载LabVIEW Scripting 的安装包。安装包在页面的最下方。比如,我的电脑是WindowsXP操作系统,LabVIEW版本2009,那就下载 LabVIEW 2009 Scripting API -WinXP.zip 这个安装包。这个安装包会为LabVIEW添加一个 LabVIEW Scripting许可证,许可证还要激活后才能使用。.但是要注意,在安装LabVIEWScripting时会让用户选择labVIEW的安装路径,如果你的labVIEW是安装在默认路径:C:ProgramFiles......下,那就没有任何问题,但是如果你的labVIEW安装在自定义的路径下,NI License Manager会找不到LabVIEW Scripting 的许可证。因为许可证被默认安装到C:ProgramFilesNational InstrumentsSharedLicenseManagerLicenses下,文件名为:LabVIEW_Scripting_PKG_090000.lc,把这个文件复制到你的自定义安装路径下:安装盘:ProgramFilesNational InstrumentsSharedLicenseManagerLicenses,OK. 打开NI许可证管理器,找到LabVIEWxx版本下“工具包->Scripting Development”,选择激活。输入注册码“L12S86758”(这是NI提供给所有用户,专用于激活LabVIEW Scripting高级功能的注册码)就可以将 LabVIEW Scripting 的高级功能激活了。 激活 LabVIEW Scripting后,再打开LabVIEW,可以看到在函数选板“Programming->ApplicationControl”下,多出了三个函数,这三个函数分别用于创建一个新的VI,得到某VI上某个对象的引用,和创建一个新的对象。这里说的对象包括前面板的控件,程序框图上的函数、结构、子VI、数据线,等。并且,在使用Property Node和InvokeNode的时候会发现,它们多出了很多新的属性和方法共用户使用。使用这些 LabVIEW Scripting的高级功能,几乎可以完成所有手工编辑VI可以完成的操作。
2023-07-14 11:36:191

赤藓糖醇可以长期吃吗?

不能,长期食用代糖对健康的影响需要提醒人们注意。比如,阿斯巴甜属于二肽型甜味剂,一些研究提示,它可能会干扰氨基酸代谢,影响到神经递质平衡,例如影响大脑中儿茶酚胺类物质的水平,使神经系统过度兴奋,从而不利于人体的抗焦虑抗抑郁功能。她在其公众号的文章中表示,从机理上来说,甜味剂让人感觉到甜味,却不能引起血糖的相应增加,属于对人体代谢系统的“欺骗”,这种长期多次的欺骗,容易造成代谢调控机制的紊乱。扩展资料“不要因为里面‘没有真正的糖",就纵容自己对甜味食物和饮料的喜好。”范志红建议,过度嗜好甜味本身,就是一种不健康的饮食行为,接受天然食物的口味,主要从水果、水果干等天然食物中获得甜味,才是合理的方式。无糖并不意味着不甜,而是把各种代糖当作甜味剂来满足口感。根据我国《预包装食品营养标签通则》的规定,食品中的糖含量少于0.5g/100g(固体)或100mL(液体),即可标注为“无糖食品”。如果想完全追求健康,白水是当之无愧的正确选择。参考资料来源:人民网-年轻人青睐代糖产品 健康与美味真能兼得?
2023-07-14 11:36:191

对数logaN的正确读法。急,,在线等。。。

后面的读法是正确的。
2023-07-14 11:36:167

苛的意思

严厉、苛刻
2023-07-14 11:36:151

on souhait que 用什么时态?虚拟还是?

虚拟
2023-07-14 11:36:142