单项选择题
A.OBA B.OTU C.SMR42 D.OSC
A.1550nm/1310nm B.1480nm/980nm C.1550nm/1480nm D.1310nm/980nm
A.NCP B.OSC C.OHP D.OA
A.20dBm B.22dBm C.25dBm D.27dBm
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