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...