关于声现象，说法正确的是_刷题宝

题干

关于声现象，说法正确的是（）

A：只要物体振动，我们就能听到声音

B：声音的传播速度是340m/s

C：声音是一种波，它具有能量

D：“禁鸣喇叭”，是在声音传播过程中减弱噪声

上一题下一题 0.0难度选择题更新时间:2017-03-02 04:26:27

答案(点此获取答案解析）

C

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9的平方根是（）

同类题2

80×3＝____

500×6＝____

120×4＝____

同类题3

如图，四边形ABCD是

⊙ O

的内接四边形，

∠

∠

D的度数为（）

同类题4

阅读短文，选择最佳答案。

A

Look! This is a picture of my teacher's family. This is Mr. Smith. He is my English teacher. His wife is a doctor. She is nice. They have a son and a daughter. The boy's name is Sam and the girl's name is Kate. They are students. They are in the same school. They go to school on their bikes. Look! The son is like his mother. The daughter is like her father. Now they are all in China and can speak Chinese. They love China.

同类题5

如图所示是汽车起重机的示意图，当用它从水中吊起重物时，下列说法正确的是

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