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
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