A.40 B.80 C.160 D.196
A.OMU B.ODU C.ITL D.OADM
A.進(jìn)行波長(zhǎng)轉(zhuǎn)換 B.功率放大 C.中繼 D.波長(zhǎng)轉(zhuǎn)發(fā)