A.2 B.6 C.7 D.8
A.業(yè)務(wù)運(yùn)營(yíng)支撐系統(tǒng) B.經(jīng)營(yíng)分析系統(tǒng) C.業(yè)務(wù)支撐網(wǎng)網(wǎng)管系統(tǒng) D.計(jì)費(fèi)數(shù)據(jù)源