A.Carrier Sense Multiple Access with Collision Detection
B.Control Sense Multiple Access with Collision Detection
C.Carrier System Multiple Access with Collision Detection
D.Carrier Sense Media Access with Collision Detection
A.1/2
B.1/4
C.1/8
D.1/16
A.增加160m
B.增加80m
C.减少160m
D.减少80m