A.無(wú)破損 B.無(wú)丟失 C.無(wú)折斷、竄出、丟失
A.K2 B.8A C.K4 D.K6
A.貨車轉(zhuǎn)向架 B.制動(dòng)裝置 C.車鉤緩沖裝置 D.輪對(duì)