单项选择题
A.1552.12nm B.1552.52nm C.1553.52nm D.1553.12nm
A.同步复用设备 B.终端复用设备 C.分插复用器 D.再生器
A.dspcdalms B.dspndalms C.dsppnports D.dspcds
A.ALL5 B.ALL1 C.ALL2 D.ALL3/4
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