changeover
特殊用法aerial changeover1.■天线转换automatic changeover1.■自动转换开关brake changeover1.■制动转换charging changeover1.■充气转换locomotive changeover1.■列车机车的更换manual changeover1.■手摇转向机构manual-automatic changeover1.■手动-自动变换overlap changeover1.■交叉转换power supply changeover1.■电源 转换stage changeover1.■换挡changeover of traction units of train1.■列车牵引机组的更换