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非旋转式,双作用,双杆。
Non-rotating, double acting, double rod.
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两个泵转子通过旋转的抽油杆实现驱动。
Two pump rotor spinning rod through the implementation drive.
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螺纹杆与齿轮相啮合;改变轴旋转运动的方向。
The spirally threaded shaft of a worm gear.
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螺纹杆与齿轮相啮合;改变轴旋转运动的方向。
The spirally threaded shaft of a worm gear.
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