单项选择题
A.ADSL B.FTTX+LAN C.HFC D.ADSL和FTTX+LAN
A.28个VP B.212个VP C.28～212个VP D.216个VP
A.28个VC B.212个VC C.28~212个VC D.216个VC
A.IP over ATM B.IP over SDH C.IP over DWDM D.IP over ATM和IP over SDH
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