英翻中时一个英文单词可以翻几个汉字?

空间向量基本定理（请写出过程）
已知OA、OB、OC不共面,OP=x*OA+y*OB+z*OC,当P在面ABC中时,x、y、z有什么关系?

一道心理题 关于范进中举
“范进中举”故事中当范进得知考中时的情绪状态是（）
A 应激 B 心境 C 激情 D 焦虑
该选哪个呢 最好有理由

天平的数学题
某人用一架不等臂天平称一块铁的质量,当把铁块放在天平上左盘中时,称得它的质量为300克;当把铁块放在天平右盘中时,称得它的质量为900克,求这一铁块的实际质量.（根号3≈1.732）（要说明做法,不要直接给公式等,要具体说明了才懂啊）
我都说了不要直接给答案啊，给我说明，

谁帮我完成下面这道题?着急啊!
原文：
我到夏中时,还没有开学,正是热得要命的时候,庄先生夫妇约我去洗海水浴,差一点我被海浪卷去了生命.原来我生平没有看见人家游泳过,只在画报上看到一些游泳的照片,既然来到了海滨,而且天气这么热,自然我想下水去练习练习；没想到海浪是这么可怕的,它突然袭来.我被卷去了丈多远,口里灌进去很多海水,咸得我大声叫喊“救命呀!救命呀!”他们连忙把我的膀子捉住,又是一个大浪打来,把我们卷去了丈多远.海水越来越深,连最会游泳的都失去了控制的能力,何况我是个初下水的人?
译文：
I_____（come)back to Xiamen _____(fill)the teaching post before school began.It______(be)unbearaly hot.so Mr.Zhuang and his wife_____(invite)me______(go)seabathing with them.But surprisingly it______(end)up in my narrow escape from the surging waves.As I never in my life_____(see)people swim except in some pictorials and as the weather______(be)so hot.I_____(be)at the seaside and not_____(know)how dreadful the sea could______(become),naturally_______(feel)like______(have)a go at dabbling in the water.Suddenly the violent waves_____(come)upon me and________(carry) me quite a few meters away."Help!Help!"I_____(cry) out with lots of salty seawater in may mouth.They_____(rush)to my rescue. But no sooner they____(seize)me by the arm than the surging waves_____(return)_____(carry) all of us quite a few meters away. In an increasingly rough sea, even a good swimmer may____(lose) all control over himself,let alone me,an absolute beginner in the art of swimming.