单项选择题
A.SNTP B.IRIG-B C.PPS D.PPM
A.Appid、GOID、GOCBRef、DataSet、ConfRev B.GOCBRef、DataSet、ConfRev C.Appid、GOID D.GOID、GOCBRef、DataSet
A.MMS GOOSE B.MMS SV C.GOOSE SV D.MMS GOOSE SV