天然表面的;
Theory of Self-organization Faced No Puzzle
自组织理论没有面临难题
A new type self contained and double faced mechanical seal has been succesfully developed for marine pumps which can operate with zero leakage under sea water and make pumps operate normally under an evacuated condition.
该文介绍了一种能使舰船用海水泵实现零泄漏,并在抽空状态下正常工作的新型集装式双端面机械密封。
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