The instrumental variable in this instance allows a clear, credible estimate of the return from extra schooling for those most inclined to drop out from school early.
在这一研究中，对于那些倾向于尽早离开学校的人而言，使用辅助变量法就能够得出清晰可信的结果。
2
Numerical simulation using the methods of characteristics in a horizonal pipeline, the pressure drop in inclined pipeline, and the long distance plug-flow pneumatic conveying are reviewed.
此外评述了用特征线方法进行水平管的数值模拟，倾斜管的压力降计算和长距离的栓流气力输送。
3
Basing on the conception of local drag coefficient in the pipeline field, the pressure drop coefficient of fluid in each inclined flue under different condition of pressed brick was calculated.