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问题详情

An alternative to plain old telephone service (POTS) would be:（）

A、X.25.

B、Asynchronous transfer mode (ATM).

C、VoIP.

D、Public Switched Telephone Network (PSTN).

时间：2022-04-20 20:48 关键词： CMS专题 CompTIA认证考试 220-702

答案解析

C

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