（)是NS（GB Network Service Layer)的功能 .A.LLC PDU 的传输B.对NSE中多个NS－VCs 的上下链路

()是NS(GB Network Service Layer)的功能 .

A.LLC PDU 的传输

B.对NSE中多个NS-VCs 的上下链路的共享

C.对NS-VC的管理

D.传输BSSGP PDU

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