A.1+1 B.負(fù)荷分擔(dān) C.N+1 D.M+N
A.139網(wǎng)段 B.129網(wǎng)段 C.128網(wǎng)段 D.172網(wǎng)段
A.RCB B.RGUB C.ROMB D.APBE