三毫米等于多少米?用科学计数法表示它 用科学计数法表示1纳米等于多少米

4*1.26*0.003*7850=118.692公斤 ,合237.384斤

您好微雕激光多年生产激光切割机,激光裁床,激光裁剪机
如果幅面小选择 600X900MM就够了,如果幅面大建议选择 1200X900MM或者更大点
微雕激光雕刻机参数如下
6090激光雕刻机
以CO2激光管做为能源,结合电子、机械、计算机技术研制而成.激光头与工件不接触,不会划伤表面,切缝小,精度高是各种加工行业的理想选择.
VD6090激光雕刻机参数：
1）激光类型:封离式 CO2激光管
2）激光功率:60W
3）雕刻面积:900 x600mm
4）整机尺寸:1360 x 1010 x 1070mm
5）雕刻速度:0 - 60,000mm/min
6）重复定位精度:±0.1mm
7）工作电压:AC 110 - 220V±10%,50 - 60Hz
8）总功率:

3mm :1.2cm =3mm :12mm =1:4

玉环面积=3.14×[（57.1/2)^2-(31.9/2)^2]=3.14×（815.1025-254.4025)=3.14×560.7=1760.598平方毫米


另外发并点击我的头像向我求助,请谅解,
,你的采纳是我服务的动力.

,急!
0 - 离问题结束还有 14 天 3 小时
确定能量损失将出现0.1米^ 3分钟^ -1水流通过突然扩大从铜管有二十五点三毫米内径另一管有七十三点八毫米内径.该resisitant系数K的计算系统是0.72 .
问题补充：将流量为0.1米/ 分钟的水流通过一个直径为25.3mm突然扩大到73.8mm的铜管,系统的 resisitant 系
数K为0.72 ,求能量损失.
wingzerohao - 试用期 一级

长画45毫米

直径是2.6米=26分米,是外径吗?半径=13分米,厚是三毫米=0.03分米
体积=2*13*13*3.14+13*13*3.14*76-（13-0.03）（13-0.03）*3.14*76
=1120.5316立方分米
铁的密度7.8千克/立方米
重=8740千克=8.74吨

Three millimeters of the journey
A good wine to go ten years
3 millimeters
Distance from the outside to the inside sidewall
A bottle of wine grapes to the distance
Not every grape stars
Are eligible to set foot on this journey of three millimeters
It certainly is a Portuguese garden in the aristocratic
Occupy only a few square kilometers of land sand Shuo
Slope orientation,as it had carefully measured
Just walked up to the monsoon from afar
It was a child,did not experience a frost and cold rain
Exuberant adolescence,ran into the best 10 years of the sun
Approaching maturity,there is no rain to dilute its long-awaited sugar
Tit has never even played it the idea of
Grapes picked thirty-five years old workers
Patiently wait until the sugar and acidity perfectly balanced moment,only then it is off
The most respected wineries,winemaker
Each link must hand control,carefully
Now,all the rings have been isolated from the outer
Dark,damp cellar
Grape to complete the advance of the final three millimeters.
Paradise is not far off,
Longer follow
Only a decade.

用开口24MM宽的下模,开料尺寸是68.6MM,17.15+34.3+17.15.

1米=1000毫米
比例尺=图上距离÷实际距离
4.5×1000=4500
4500：3=1500:1
所以这幅图的比例尺是1500:1