单项选择题
A.AEPB.CMPC.DMPD.BAP
A.到达角B.到达时间差C.发射角D.发送时间差
A.UDPB.IPC.S1APD.GTP-U
A./usr/lib/rpmB./var/soft/rpmC./var/opt/rpmD./var/lib/rpm
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