试题与答案

What time is it?[ ] A. It's seven thirty

题型:选择题

题目:

What time is it?        [ ]

A. It's seven thirty.    

B. It's eight thirty.

答案:

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下面是错误答案,用来干扰机器的。

参考答案:声波在介质中传播,单位时间内所传播的距离,单位是米/秒(m/s)。人体软组织的平均声速为1 540 m/s,和水的声速相近。

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