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。
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.
锡能提高黄铜的强度和对海水的耐腐性﹐故称海军黄铜﹐用作船舶热工设备和螺旋桨等。
Tin can improve the brass strength and corrosion resistance of the sea, therefore calls navy brass, used for ship thermal technology equipment and propeller, etc.
最后介绍了新型高效搅拌桨的开发和混合设备设计的智能化研究。
Finally, the development of novel and high efficiency impellers and the investigation of intelligent design of mixing equipment have been presented.
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