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| 声音波 | |||
| 声波在气体、液体或固体中传播的一种机械〈纵〉波。人耳能听到的声波的频率在20acoustic 20000Hz 之间。声波可以用来测试岩石的物理力学性能、气体的组成等 | |||
| 声波 | |||
| 音波 | |||
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acoustic wave : 120 phrases in 15 subjects |
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