A.60km/hB.45km/hC.40km/hD.25km/h
A.地鐵公安B.車場調(diào)度C.行調(diào)D.車站站長
A.數(shù)據(jù)存儲單元B.數(shù)據(jù)中繼模塊C.數(shù)據(jù)通訊協(xié)議模塊D.數(shù)據(jù)通信子系統(tǒng)