... natural frequency of an antenna 天线自然频率... natural frequency of tube 管子固有频率... natural fruits 天生孳息...
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sound natural frequency of tube 管道声学固有频率
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Natural vibration characteristic of gun tube was analyzed triumphantly. Vibration frequency and mode shape were obtained.
对某火炮身管固有振动特性进行了分析，计算得到了振动频率和振型。
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