The optimum distributionofcirculation on a marine propeller blade is numerically determined by using the lift_line vortex model and variational calculus.
利用螺旋的升力线模型和变分法原理对螺旋桨叶片环量分布进行了数值优化。
2
The extreme difficulty in tracing the manufacturing and distribution channels of counterfeit medicines makes their circulation on markets difficult to stop.
由于在追查制造假冒药品及其分销渠道上困难重重，因而难以阻止假冒药品在市场上的流通。
3
The extreme difficulty in tracing the manufacturing and distribution channels of SFFC medicines makes their circulation on markets difficult to stop.