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["日曜日の清掃問題 713",,"機械密封の特徴は、軸方向密封が容易に漏れやすいものを、静密封および端面径向接触密封という比較的漏れにくい密封に変更することである。 ( ) √"]

2019-07-14View Original

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判断题: 机械密封的特点是将容易泄漏的轴向密封改变为较难泄漏的静密封和端面径向接触密封。 ( ) √

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