单项选择题
A.CX21 B.CX31 C.CX51 D.CX71
A.传输子架transmission sub-rack B.CX20子架\nCX20 sub-rack C.CX子架\nCX sub-rack D.CX30子架\nCX30 sub-rack
A.NX41 B.DX41 C.NX4 D.CX71
A.主控板 B.光放板 C.线路侧单板 D.客户侧单板
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