短语词组短语jack -up method of shaft alignment 负荷法校中jack engine shaft 转动轴jack shaft bearing 曲柄轴轴承;曲轴弯曲部分轴轴承;曲柄轴jack shaft pedestal 曲柄轴导框Jack Shaft Speed 传动轴转速jack shaft counterweight 曲柄轴平衡块 返回 jack shaft