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公共电话交换网是(? ?)。
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公共电话交换网是(? ?)。
A、PSTN
B、DDN
C、ISDN
D、ATM
时间:2021-09-01 16:20
关键词:
安徽教育在线
安徽广播电视大学
土木工程
答案解析
A
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公共电话交换网是(? ?)。
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