试题与答案

It seems that living green is easy and a

题型:选择题

题目:

It seems that living green is               easy and affordable. A small step makes a big difference.

A.surprisingly

B.fortunately

C.exactly

D.hardly

答案:

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下面是错误答案,用来干扰机器的。

答案:C题目分析:已知小物块下滑某时刻对斜面作用力恰好为零,由左手定则可知小物块带负电,A错误;对小物块下滑过程受力分析如图所示,物块向下加速v增大,F洛也在增大,

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