试题与答案

韵律常包括()、交替韵律、渐变韵律三种形式。

题型:填空题

题目:

韵律常包括()、交替韵律、渐变韵律三种形式。

答案:

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参考答案:50±10t/h;2.5m;20----25℃

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Last week, the TV-Turnoff Organization began its ninth TV-Turnoff __43__ in the USA. The Organization encourages people to play games, read books, lie under a tree, talk to family members and friends __44___ watching TV.
American school children __45__, on average(平均), 1000 hours a year watching TV--more time than they spend in school. That’s too much, said the doctors __46__organized this year’s TV-Turnoff Week.
Doctors said that the __47_ children watch television, the more overweight they may become. The food children eat while they watch the television makes this weight __48_ more serious.
To keep mentally and physically healthy, children need to take exercise, talk with friends and family, read, and __49_ the world around them. Could you go a week without television? It might be __50__ for many TV lovers, but why not give it a try?
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如图所示,两根相距为l的平行直导轨ab、cd、b、d间连有一固定电阻R,导轨电阻可忽略不计;MN为放在ab和cd上的一导体杆,与ab垂直,其电阻也为R;整个装置处于匀强磁场中,磁感应强度的大小为B,磁场方向垂直于导轨所在平面(指向图中纸面内);现对MN施力使它沿导轨方向以速度v(如图)做匀速运动;令U表示MN两端电压的大小,则(  )

A.U=vBl,流过固定电阻R的感应电流由b到d

B.U=vBl,流过固定电阻R的感应电流由d到b

C.U=vBl,流过固定电阻R的感应电流由b到d

D.U=vBl,流过固定电阻R的感应电流由d到b

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