单选题Which of the following is equipment provided by the telephone company that provides remotediagnostic and loopback services for subscriber lines?（）A66 blockBDemarcCSmart jackD110 block
单选题
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
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