单项选择题
A.4块B.3块C.2块
A.MSR3600-28/51是百兆下行,千兆上行,单电源B.MSR3600-28/51-X1是千兆下行,千兆上行,单电源C.MSR3600-28/51-SI是百兆下行,千兆上行,双电源D.MSR3600-28/51-X1-DP是千兆下行,千兆上行,双电源
A.8GBB.4GBC.2GBD.6GB