单项选择题
A.BT B.P2P C.PnP D.B2B
A.85 B.60 C.50 D.75
A.DVD-RWDVD+RWDVD+ROW B.DVD-RWDVD+RWCD-RW C.DVD-RWDVD+RWDVD-RAW D.DVD-RWDVD+RWDVD-ROW