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计算题：车削外圆时，主运动为旋转运动，试样待加工表面直径dw=12mm，工件转速n=500r/min，求最大切削线速度v（m/s）？

答案

参考答案：

v=（π*dw*n）/（1000*60）=（3.14*12*500）/（1000×60）=0.314m/s

最大切削线速度v为0.314m/s。

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                                                               PEN PAL WANTED
     I'm Li Jiacheng.  My English name is Jim. I'm a 14-year-old boy.  I live in the city of Chengdu in
 China.  I speak Chinese and I can speak a little Japanese.  I have a small family,  my father,  my mother
 and I.  I'm lonely(孤单的).  I enjoy playing basketball and I like Japanese very much,  (A) but I can't
 speak it well.  So (B)I want a pen pal to help me with my Japanese.
     Please write to me if (假如) you want.

任务一、1. 根据这封信完成下面这张身份卡片。

   


1. Chinese Name: _____
2. English Name: _____                                                             
3.  Age: _____ 
4. Country: _____
5. Language: _____ 
6. Family: father and mother Address: _____
7. Favorite Sport: _____
8. Favorite Subject: _____                                           

任务二、9. 把划线句子A 改为同义句。
  . . . but my spoken (口头的) English _____ _____.
任务三、10. 把划线句子B 翻译成汉语。
  _____________________________________________
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晚成雏
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