At last, the variable frequency technology for LOX loading pump is presented.

最后介绍了用现代变频器实现加注泵调速的技术。

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The mechanical system is composed of testing mechanical assembly, hydraulic loading pump station, pressure increasing and holding device for tested media, and sensors.

其中，机械系统由试验台架、液压加载泵站、试验介质增压保压装置和传感器等部件组成；

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The seal life of LPG loading pump is short because of instant changes of pressure severe operating cases caused by and environmental impact. Thus it causes serious leakage of LPG.

液化石油气(简称LPG)装车泵因压力瞬变和环境影响而工况恶劣，造成该类泵密封使用寿命短，液化气泄漏严重。

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The Act banned the ownership of semi-automatic and pump-action rifles, weapons which fire explosive ammunition, short shotguns with magazines and elevated pump-action and self-loading rifles.

BBC: Mass shootings and gun control