acoustic load聲負載acoustic material隔聲材料acoustic mechanical efficiency聲機械效率acoustic power聲功率acoustic pre ure聲壓acoustic radiation pre ure聲輻射壓acoustic reactance聲抗acoustic resistance聲阻acoustic resonance共識acoustic velocity聲速acoustical聲的acoustical wave聲波acting force織力action at distance超距酌action center運動中心action integral酌積分action of deflagration爆燃酌action of force力的酌action principle酌原理action here酌區action turbine沖喚渦輪action variable酌變量action wave酌波activation活化active earth pre ure織土壓active flight織飛翔active force織力active gas活性氣體active load reaction有功負載反酌active pre ure織壓力activity of force力功率actual load實際載荷actual stre實際應力