作者还认为，常规式抽油机的曲柄旋转方向应规定为逆时针，并建议研制可调相位角的曲柄平衡重。
The author holds further that the crank pin rotation on conventional pumping units should be assigned in counterclockwise...
作者还认为，常规式抽油机的曲柄旋转方向应规定为逆时针，并建议研制可调相位角的曲柄平衡重。
The author holds further that the crank pin rotation on conventional pumping units should be assigned in counterclockwise...
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