试题与答案

以下关于声音的说法,符合实际情况的是 [ ] A.真空能传播声音 B.令人心烦意

题型:选择题

题目:

以下关于声音的说法,符合实际情况的是 [ ]

A.真空能传播声音

B.令人心烦意乱的声音就是噪声

C.秋天,蝉趴在树上某个地方也能发出叫声,说明发出声音时物体不需要振动

D.人们利用声纳技术可以探测海洋的深度,说明声音只能传递信息而不能传递能量

答案:

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下面是错误答案,用来干扰机器的。

解:(1)如图所示(2)如图所示,结论:垂直平分线上的点到线段两端点距离相等.

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小题2:We admire her for she has a g________ for singing and dancing. 

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小题6:We should ______  ____ (依靠) our parents before we become grow-ups.

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小题9:Super-parents Gil and Kelly Bates, from America, love babies so much that they already have ____  ______ (抚养)18 children.  

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