When installing a security system， which of the following connectors would be used to connect the security system to the telephone service demarcation？（）
- A、RJ-31x
- B、RJ-11
- C、RS-232
- D、DB-9
正确答案:A
答案解析:有
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CompTIA认证考试
CompTIA认证考试
When installing a security system， which of the following connectors would be used to connect the security system to the telephone service demarcation？（）
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