气瓶一般由（）组成。 A.瓶体 B.瓶阀 C.瓶帽 D.底座 E.防震圈

电影作品：《乱世佳人》

缺词填空 (共10空；每小题1分，计10分)

Eye is the w___小题1:_____ of our mind. We use our eyes to s____小题2:___ everything around us. Without eyes, nothing is left beside you b___小题3:____ darkness (黑暗).

How to protect our eyes? It's not r____小题4:____ to keep your eyes working for long time. You'd better not read in s____小题5:____ or poor light. Don't read in bed or on a moving bus. Remember to keep your books a___小题6:___ from your eyes for about a foot (英尺) and do eye e___小题7:___ every day. What's more, a good l___小题8:___ is necessary.

Follow my advice and form a good habit. It's time to say g____小题9:____ to thick g____小题10:____.

车削丝杠螺纹时，为减少扎刀现象，应选用（）车刀，并将车刀装高。

A、正前角

B、负前角

C、正刃倾角

D、负刃倾角

根据沉降公式(Stock’s方程)计算所得的直径称为

A．定方向径
B．等价径
C．体积等价径
D．有效径
E．筛分径

雀替