单项选择题
A.1 B.2 C.4 D.6
A.负57VDC~负40VDC B.负55VDC~负36VDC C.负58VDC~负41VDC D.负58VDC~负38VDC
A.单盘损坏 B.光模块损坏 C.数据业务配置错误 D.中继电缆损坏
A.EMU盘故障 B.OSC盘故障 C.光缆过长 D.网元停电
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