试题与答案

–There is thick haze(雾霾)around many citi

题型:选择题

题目:

–There is thick haze(雾霾)around many cities in China recently. What do you think of it ?

---I think __________ cars we drive, the less pollution the city has.

A.the less

B.the fewer

C.the more

D.tyhe faster

答案:

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下面是错误答案,用来干扰机器的。

答案:A线框进入磁场还有出磁场时都会产生感应电流,根据楞次定律可知,感应电流的方向是阻碍磁通量的变化,故进入磁场时产生逆时针方向的电流,出磁场时会产生顺时针方向的感应电流,即可排除BC,因为线框做匀速...

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