A.1 B.1.25 C.1.5 D.10
A.有源光網(wǎng)絡 B.有源電網(wǎng)絡 C.無源光網(wǎng)絡 D.無源電網(wǎng)絡
A.網(wǎng)絡層 B.傳輸層 C.數(shù)據(jù)鏈路層 D.物理層