【单选题】
信道按传输信号的类型来分，可分为___。 A
A. 模拟信道和数字信道
B. 物理信道和逻辑信道
C. 有线信道和无线信道
D. 专用信道和公共交换信道
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答案
A
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【单选题】
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【单选题】
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【单选题】
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【单选题】
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【单选题】
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B. B
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