抽油机井上下冲程载荷差异很大，上冲程驴头悬点承受（），因此需_爱下问搜题

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问题多项选择题

抽油机井上下冲程载荷差异很大，上冲程驴头悬点承受（），因此需要采用平衡装置来保证设备正常运转。

A、活塞截面以上液柱重量

B、抽油杆柱在液体中重量

C、摩擦载荷

D、惯性载荷

答案

参考答案：A, B, C, D

完形填空

完型填空。
     Look at the boy. He is __1__ good friend. He is __2__ American boy. __3__ name is Tom. __4 _
12. My  _5_  is Wang Lei. __6__ a Chinese boy. I'm 13.
     Tom _ 7__ a small sports collection. He has __8__ tennis racket, three basketballs and four soccer
balls, But I only have __9__ baseball. Tom and I _ 10__ sports every Sunday .

( ) 1. A. I
( ) 2. A. a
( ) 3. A. His
( ) 4. A. She
( ) 5. A. name
( ) 6. A. I
( ) 7. A. have
( ) 8. A. one
( ) 9. A. a
( ) 10. A. plays

B. You
B. an
B. She
B. She's
B. book
B. I'm
B. has
B. two
B. two
B. play

C. me
C. the
C. Her
C. He's
C. friend
C. She
C. doesn't have
C. three
C. three
C. playing

D. my
D. /
D. She's
D. His
D. bag
D. She's
D. doesn't has
D. four
D. four
D. to play

单项选择题

沥青混合料应在混合料摊铺后( )条件下进行。

A．潮湿

B．较低温度

C．适当温度

D．较高温度