Networks use microwave radio to link the computers when ______.
A.they are close together
B.they are far away from each other
C.coaxial cables are used
D.fiber optical is used
第3题
A.亲;义;别;序;信
B.序;别;信;亲;义
C.亲;序;义;别;信
D.义;亲;序;别;信
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