Rotatory plunger Anti partial Friction Pump This kind of pump is used in small inclination oil well.
旋转柱塞防偏磨抽油泵适用于斜度小的油井。
The important factors influencing the radial clearance of anti friction bearings are analysed theoretically.
从理论上分析了滚动轴承径向游隙的重要影响因素。
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