Using a unique set of repeated cross-sectional data this paper examines the causes of this increase in earnings inequality.
本文使用一个独特的由多年很截面数据组成的数据库对收入不平等在这期间的增长进行分析。
As the procedure is simple for stress in meridian direction, this paper only discusses how to use the cross-sectional method to determine hoop stress and other aspects of applications.
由于壳体经向应力求解过程比较简单，本文只给出了如何应用截面法求解壳体环向应力，并举例说明了该方法在其它方面的应用。
The paper introduced the working principle of sectional mode hoisting system of permanent magnet linear synchronous motor.
介绍了分段式永磁直线同步电机提升系统的工作原理。
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