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【单选题】
烽火R2001面板上的“COL“指示灯表示什么含义（）A.
CRC校验错误
B.
E1收信号帧失步告警
C.
以太网口检测到冲突
D.
表示以太网口为工作模式
拍照语音搜题，微信中搜索"皮皮学"使用
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