双变径轮式抽油机是在继承常规游梁式抽油机优点的基础上设计而成的大载荷、长冲程、低冲次节能型抽油机。
A dual variable-diameter wheel pumping unit, which has long stroke and low pumping speed and large load capacity, is designed based on conventional beam pumping units.
弯管内模支撑由半圆弧形支撑架与双变弧垫模组成。
The inner mold support of a knee pipe is composed of the semi-circular arc-shaped support frames and a bivariate arc pad mold.
提出了一种可借助于最小敏感性原理求解本征能量的双变分参数的近似方法。
It proposes an approximation method with two variational parameters for finding the eigen-energies by principle of minimal sensitivity.
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