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问题 问答题

如图甲所示的钢丝钳，A为剪钢丝处，B为手的用力点，0为转动轴，乙为单侧钳柄及相连部分示意图．请在图乙中画出剪钢丝时的动力F1、阻力F2、动力臂l1、阻力臂l2．

答案

找出支点，从O做F1的垂线段就是F1的力臂，从O做F2的垂线段就是F2的力臂，如下图所示．

单项选择题

卧式重力式分离器的主要结构部件有连通管、()、积液包、进出口管等。

(A)筒体、排污管、液位计;

(B)球体、排污管、差压计;

(C)椭圆体、排污管、温度;

(D)简体、排污管、温度计
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填空题
从方框中选择适当的选项填人短文中,使短文通顺、完整.选项中有两个选项是多余选项。
A. get   B. excited   C. but   D. what   E. some   F. die
G. into   H. tries     I. much  J. note    K. heart   L. and
      A man is traveling in the desert and loses his way.
     He  has  no  water to drink and thinks he will l. _________. After walking for two days, he finds an
old wooden house. He  enters  the  house, and finds a water pump(泵).  He is very 2. _________and
goes  to  pump  some  water,  but no water comes out. He loses 3._________, and sits on the ground.  
Then he sees a bottle near the water pump.  It's full of water and there is a 4._________ on it.  It says,
  "You must put the water of the bottle into the water pump to 5. _________water out.  Don't forget to
fill this bottle when you leave. "
     He  looks  at  the  bottle of water, and  can't  decide 6. _________to do.  If he drinks the water,  he
may be able to survive in the desert for a while,  7. _________if he puts the water into the water pump,
he may get enough water to help him get out of the desert or get nothing. Finally, he puts the whole bottle
of water 8._________the water pump. He again 9. _________to pump water out,  and this time plenty
of water comes out.  He drinks as 10._________as he can, and then fills the bottle with water again.
     A few days later, he walks out of the desert.
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