A.列檢B.定修C.廠修D.架修
A.車體B.轉(zhuǎn)向架C.制動(dòng)系統(tǒng)D.車輛連接裝置
A.社會經(jīng)濟(jì)調(diào)查B.客流調(diào)查C.經(jīng)濟(jì)分析D.客流分析