问题
单项选择题
(73) is a device which enables digital microcomputers to communicate across analog telephone lines.
A．The switch
B．The modem
C．The hub
D．The repeater
答案
参考答案：B
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(73) is a device which enables digital microcomputers to communicate across analog telephone lines.
A．The switch
B．The modem
C．The hub
D．The repeater
参考答案：B