A.分組交換網(wǎng) B.數(shù)字數(shù)據(jù)網(wǎng) C.幀中繼/ATM網(wǎng) D.IP數(shù)據(jù)網(wǎng)
A.鉛護套電纜 B.鋁護套電纜 C.橡膠電纜 D.塑套電纜
A.集成度高 B.體積小 C.功能強 D.維護量小