Jack: in practical mechanics, portable hand-operated device for raising heavy weights through short distances, exerting great pressures, or holding assembled work firmly in position.

千斤顶：在应用力学中，指携带方便、以手操作的装置，可将重物稍微抬高，能施加巨大压力，或将装配好的对象牢固地支撑在原地。

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As the volume of newly operated unit increases, rotor's weight increases as well and has higher requirement for jack pump system.

同时随着新上机组容量的增大，转子的重量也随之加大，对顶轴油系统的要求也越来越高。

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Horizontally pushing lifting jack of direct shear tests are operated on rock mass shear strength test. - center point group analysis is used for treating shear test data.

用平推法直剪试验进行岩体抗剪断强度试验，用-点群中心法处理直剪试验数据。

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