The new-defined displacementcoefficient, though still constant, is greater than traditional one.
新位移方程的系数也比传统假定下的位移方程的系数大，但也仍为常数。
2
On the basis of a large number of field test data, the regression of the displacementcoefficient and system efficiency for pumping unit wells were established.
On the basis of a large number of field data, the regression equations of displacementcoefficient, down-hole power loss and surface efficiency for pumping wells are established.