A.電話+電傳+傳真+數(shù)據(jù) B.電傳+數(shù)據(jù) C.電話+電傳+數(shù)據(jù) D.電話+傳真+數(shù)據(jù)(ISDN+MPDS)
A.0 B.1 C.2 D.3
A.常規(guī) B.安全 C.緊急 D.遇險(xiǎn)