A.删除和插入B.查询和检索C.统计和修改D.检索和更新
A.删除和插入
B.查询和检索
C.统计和修改
D.检索和更新
A.删除和插入
B.查询和检索
C.统计和修改
D.检索和更新
A.TA
B.TN1
C.TN2
D.TE1
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.
A.HDLC
B.Frame. Relay
C.X.25
D.X.21
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