1. Introduces the application of PC programmable controller at uniflow high-speed elevator, and the principle of controlling uniflow high-speed elevator.
   介绍PC可编程控制器及其在直流高速电梯上的应用,及直流高速电梯的控制原理。
2. The pulse pump is a new-type pump, in which the fluid successively flows out in one direction by means of the pulse effect in the uniflow pipe.
   泵中流态单一,能量转换效率高,单级扬程范围较广。泵出流连续、流量较大而无气蚀危险。

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