No.7信令系统的主要特点是两局间的信令通路与话音通路分开，并将若干条电路信令集中于一条专用的信令通路上传送。
1、正确正确
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Jameshasjustarrived,butIdidn’tknowhe________untilyesterday.
is,are,was,were,willbe,aregoingtobe,have,has,hadThebeautiful________somethingthattheinnocent________notalwaysabletoappreciatefully.
WithanappropriaterelativepronounMybrotherspeaksEnglishfluently,________Idon’t.
Beforethe16thcentury,Latinwastaughtandlearnedfor____________.
TheywillgetthepreparationdoneearlyinMay.
