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 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