(71)is a device which enables digital microcomputers to communicate across analog telephone lines。

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问题 (71)is a device which enables digital microcomputers to communicate across analog telephone lines。

选项 A、The switch
B、The modem
C、The hub
D、The repeater

答案B

解析 调制解调器是一种使数字信号能通过模拟电话线路进行通信的设备。
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