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浮环密封
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浮环密封
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旋转密封
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floating-ring seal
浮环密封
靠浮动金属圆环与轴或壳体间的极小间隙限制流体泄漏的非接触式动密封。
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hovercraft
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How Adaptation Builds Complexity
How a Mosquito Operates/ The Hungry Mosquito
Howard Barker
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Howardite
howardite
howardite-eucrite-diogenite meteorite
Howard Leslie Shore
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