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【单选题】
关于计算机网络数据通信方式的描述，“______”是错误的。A.
通信在信道上信息只能在一个方向传播
B.
半双工通信在传输数据时通信双方可以交替地发送和接收数据
C.
全双工通信在信道上数据可以同时发送和接收数据
D.
全双工通信在传输数据时必须使用两条物理信道
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A.
Advertisement.
B.
The benefits of advertisement.
C.
Advertisers perform. a useful service to communities.
D.
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A.
alley
B.
allies
C.
alloy
D.
allergy
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【简答题】Advertisers Perform a Useful Service to the Community Advertisers tend to think big and perhaps this is why they’re always coming in for criticism. Their critics seem to resent them because they have ...
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