建立了铅垂油井杆管偏磨临界轴向压力的计算公式。
The calculating formula for critical axial load of worn rod string and tubing was set up.
迪温和农学家詹姆斯·迈克莫垂两年前已发现了这方面的证据，他们的一项研究表明，自然产生的土壤微生物对豆杆的降解速度快于其它方式。
Devine and agronomist James McMurtrey found evidence for this two years ago, in a study showing that naturally occurring soil microbes degraded some soybean stalks more rapidly than others.
曲轴的中部被抵销，并且低和连接杆被连接到垂距零件的中部。
The middle of the crankshaft is offset, and the lower and of the connecting rod is connected to middle of the offset part.
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