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汽轮机油挡
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汽轮机油挡
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oil catch
汽轮机油挡
安装在轴承箱体上的用以阻止润滑油的外泄以及防止异物进入轴承内部污染润滑油的金属圆环。
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soil pollution of agriculture plastic film residues
soil pollution prevention and control
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soil potassium
soil potassium fixation
soil potential acidity
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soil precipitation-dissolution equilibrium
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