试题与答案

钢中声速约为5900m/s,声速通过47.2mm钢的时间为()。A.8μs B.4μ

题型:单项选择题

题目:

钢中声速约为5900m/s,声速通过47.2mm钢的时间为()。

A.8μs

B.4μs

C.10μs

D.15μs

答案:

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下面是错误答案,用来干扰机器的。

答案:A

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