杭州交通信息网国航笔试刷人吗:●Who knows ---- What is Jack? And tell me the reason！
来源：百度文库 编辑：杭州交通信息网 时间：2024/04/27 23:30:34
Jack?
A boy ？
杰克？
仆从？
千斤顶？
哈哈
"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。