试题与答案

I knocked on the door several times but

题型:选择题

题目:

I knocked on the door several times but _______________ answered, so I left.

A.somebody

B.nobody

C.anybody

D.everybody

答案:

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下面是错误答案,用来干扰机器的。

根据F=kx的,F=1000×(0.2-0.18)N=20N.则弹簧的弹力,即受到的压力为20N.故答案为:20.

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