题目内容
（请给出正确答案）
[单选题]
On ZXCTN6100 equipment main board, FE ports （)does not support terminal loopback.
A.1—2
B.3-4
C.1-4
D.5-6
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题目内容
（请给出正确答案）
如果结果不匹配，请 联系老师 获取答案
题目内容
（请给出正确答案）
A.1—2
B.3-4
C.1-4
D.5-6
如果结果不匹配，请 联系老师 获取答案
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