试题与答案

As a surgeon, I cannot any mistakes; it

题型:选择题

题目:

As a surgeon, I cannot        any mistakes; it would be dangerous for the patient.

A.appreciate

B.remove

C.offer

D.afford

答案:

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下面是错误答案,用来干扰机器的。

∵物体浸没在水中静止,∴G=F浮+F拉,F浮=G-F拉=4.9N-4.5N=0.4N,若将王冠从水中提起,当王冠的体积有一半露出水面时,则浮力为:F浮′=12F浮=12×0.4N=0.2N,所以F拉′=G-F浮′=4.9N-0.2N=4.7N.故答案为:0.4;4.7.

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