A.A系主控(B系離線)B.B系主控(A系同步)C.B系主控(A系離線)
A.光纖B.安全數(shù)據(jù)網(wǎng)C.以太網(wǎng)D.移動網(wǎng)絡(luò)
A.無源應(yīng)答器B.有源應(yīng)答器C.無源或有源應(yīng)答器