短語詞組短語natural -vibration frequency 固有振動頻率natural vibration frequency analysis 自振頻率分析second -order natural vibration frequency 二階自振頻率natural frequency vibration test 固有頻率振動試驗vibration natural frequency 振固有頻率free vibration natural frequency 自由振動固有頻率natural frequency of vibration [電子]自振頻率structure natural frequency of vibration 結(jié)構(gòu)自振頻率Natural frequency and vibration model 振型及固有頻率 返回 natural vibration frequency