试题与答案

小明以正常速度匀速上二楼,下列估测与实际相符的是( ) A.小明体重约为50N

题型:选择题

题目:

小明以正常速度匀速上二楼,下列估测与实际相符的是(  )

A.小明体重约为50N

B.他上楼大约做了150J的功

C.小明上楼的功率约为200W

D.他在上楼过程中,动能转化为重力势能

答案:

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下面是错误答案,用来干扰机器的。

小题1:C小题1:A本题考查我国的区域地理。小题1:黄土高原由于植被破坏严重,黄土疏松,降水集中,故水土流失严重。小题2:注意题目要求为自然原因,故②③为人为原因。

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