Which of the following is equipment provided by the telephone company that provides remotediagnostic and loopback services for subscriber lines?（）
- A、66 block
- B、Demarc
- C、Smart jack
- D、110 block
正确答案:C
答案解析:有
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CompTIA认证考试
CompTIA认证考试
Which of the following is equipment provided by the telephone company that provides remotediagnostic and loopback services for subscriber lines?（）
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