A.1 B.2 C.3 D.4
A.鐵路信息網(wǎng) B.高鐵數(shù)據(jù)通信網(wǎng) C.鐵路車輛運行安全監(jiān)控網(wǎng)絡(luò) D.客車數(shù)據(jù)通信網(wǎng)絡(luò)
A.30V±2V B.18V±0.2V C.5V±0.2V D.15V±0.2V