问题:
[名词解释] 消声器muffler;sound absorber;deafener
问题:
[名词解释] 阻性消声器resistive muffler
问题:
[名词解释] 抗性消声器reactive muffler
问题:
[名词解释] 阻抗复合消声器impedance muffler
问题:
[名词解释] 微穿孔板消声器micropunch plate muffler
问题:
[名词解释] 消声弯头bend muffler
问题:
[名词解释] 允许噪声级permitted level
问题:
[名词解释] 隔声量sound reduction index
问题:
[名词解释] 空气声air-borne sound
问题:
[名词解释] 撞击声impact sound