sound proof material 隔音材料
Without proof-- - you will see this if you ever take 803-- I will tell you that the speed of sound is the square root of Young's modulus divided by the density of the material.
现在不证明-,你们将在803章学到-,我告诉你们声速,是杨氏模量的平方根,除以介质的密度。
QuietTM fire Door, made of high-quality material, is integrated with professional sound and fire proof design, and carefully manufactured and colored.
夸耶特tm隔音防火门融入了专业的隔音、防火设计、优质的材质、精细的制造、精美的着色等。
Around glue put up sealing material in the speaker surround and the anchor plate, enhancement the sound proof will raise oil to consume.
在扬声器周围和固定板周围粘贴密封材料,增强隔音会增加油耗。
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