This paper not only discusses all kinds of the loading forms and system efficiency of the life test bed for hydraulic elements, such as oil pump, oil motor and oil crock.

本文对油泵、油马达、油缸寿命试验台的各种加载形式及系统效率进行了分析，并导出了各种加载形式系统效率的一般表达式。

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Hydraulic pulverizer, also known as hydraulic clamp, by excavators, loaders and other hydraulic pump to provide power, able to crush the concrete to clean out the reinforcement and finishing loading.

又名液压钳，由挖掘机、装载机等的液压泵提供动力，能够粉碎混凝土清理出其中的钢筋并整理装车。

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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