问题：
[多选题]●SDLC was invented by IBM to replace the older Bisynchronous protocol for wide area connections between IBM equipment ．A varietion of the (71) protocol called NRM is essentially the same as SDLC．SDLC is (72) protocol like HDLC , Frame. Relay or X．25．An SDLC network is made up of (73) that controls all communications , and (74) ．It is capable of (75) operation, but almost all practical applications are strictly half duplex．HDLCFrame. RelayX．25X．21(72)
A、a peer to peer
B、a point-to-point
C、not a peer to peer
D、a peer to peers(73) A．a primary stationB．one or more primary stationsC．a secondary stationD．one or more secondary stations(74) A．a primary stationB．one or more primary stationsC．a secondary stationD．one or more secondary stations(75) A．half duplexB．full duplexC．half or full duplexD．half and full duplex
参考答案：
ACADB
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