题目内容

摩擦轮传动中,两轮的接触区受到( )作用,在( )表面上发生的变形是由拉伸逐渐变为压缩。

A. 摩擦力/从动轮
B. 切向正压力/主动轮
C. 摩擦力/主动轮
D. 切向压紧力/主动轮

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摩擦轮传动中,两轮接触区上受到摩擦力作用,在( )表面上发生的变形是由压缩逐渐变为拉伸,而在( )表面上发生的变形是由拉伸逐渐变为压缩.

A. 从动轮/主动轮
B. 介轮/主动轮
C. 主动轮/从动轮
D. 张紧轮/主动轮

在圆柱槽摩擦轮传动中,可能不会出现( ) 现象。

A. 打滑
B. 几何滑动
C. 弹性滑动
D. A+B

摩擦轮传动在两轮的表面通过接触区的过程中,摩擦力使( )。

A. 主动轮表面始终受压
B. 从动轮表面始终受压
C. 主动轮表面先受压后受拉,从动轮表面则反之
D. 从动轮表面先受压后受拉,主动轮表面则反之

1. We __ up the courage to ask the high-rank official exactly what it’s like down those forbidden streets.A. stooped B. mastered C. mustered D. took2. But they need less space because they around poles or sticks.A. turned B. circle C. curve D. twist3. The Golden Gate Bridge is the ninth longest _ bridge in the world.A. suspend B. suspension C. suspending D. suspended4. We watched him hand her some pretty pink flowers and _ against her cheek.A. leanB. whisper C. talk D. weep5. In _, he decided to go back to Beijing.A. desperation B. desperate C. depressed D. depressing6. What an odd_that he should have known your family.A. chance B. coincidenceC. accident D. incident7. She'd lowered her voice until it was barely_.A. audible B. edibleC. unbearable D. unhearable8. Constant wheelchair use will _ almost any floor surface.A. destroy B. ruinC. scuff D. break9. A_is something that seems impossible but happens anyway.A. mystery B. wonder C. miracle D. magic10. The pupil ___ to pick up the paper craps on the floor.A. loweredB. stooped C. moved D. forwarded