The guide rule and general plan to design a laboratorial test stand for drill pump valves are expounded, and the regulation and calculation of the system pressure of the stand are discussed.
系统地阐述了钻井泵泵阀试验台的设计指导思想和设计方案的确定依据，并介绍了试验台系统压力的调节方法和计算公式。
Canadian Helicopter Written Test Guide: Theory of Flight, General Knowledge Section ;
加拿大直升机笔试指导：理论飞行常识科 ；
Canadian Helicopter Written Test Guide: Theory of Flight, General Knowledge Section ;
加拿大直升机笔试指导：理论飞行常识科 ；
应用推荐