Then the pipe system becomes the main noise resource of quite submarine, when propeller noise, hydrodynamic noise and machinery noise of facility base are controlled effectively.
指出螺旋桨噪声、水动力噪声和设备机座机械噪声被有效抑制后，管道系统便成为“安静型”潜艇的主要噪声源。
The ships deck hoisting machinery such as bow gate, bulkhead valve, stern propeller and so on;
船舶用的甲板起重机械（绞车）、船头门、舱壁阀、船尾推进器等；
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