单项选择题
A.SPWB和SPWB B.SPWA和SPWA C.SPWB和SPWA D.PWD
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
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