... 用油钻井:DWO 用油冷却的:oil-flooded 用油基泥浆钻取的岩心:oil-base core ...
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空心圆锥滚子轴承可用油冷却滚子,使温升降低,从而提高了允许的转速。
Hollow tapered roller bearings available oil cooling roller, so that temperature rise reduced, thereby increasing the speed allowed.
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