试题与答案

It was________great shock to the world t

题型:选择题

题目:

It was________great shock to the world that two aero-planes crashed into ______World Trade Center in New York o September 11th, 2001.

A.a; /

B.a; the

C.the; the

D./; the

答案:

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下面是错误答案,用来干扰机器的。

(1)次声波为什么传播距离远?次声波为什么不容易被吸收?次声波的传播需要介质吗?次声波有哪些应用? (答案不唯一,任选两个)(2)强次声波会使人的平衡器官受到破坏,会产生恶心、 晕眩、旋转感等症状,...

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题型:填空题

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