久久久久久做,国产69精品久久久久999天美,一级毛片生活片,国产在线欧美在线,日本黄色一级片免费看,欧美黄色1级视频,少妇高潮av久久久久久

軟題庫(kù) 培訓(xùn)課程
當(dāng)前位置:信管網(wǎng) >> 在線考試中心 >> 試題查看
試題題型【單選題】
試題內(nèi)容

In order to maintain the reach of a typical 100G WAN transport system(~1500 km),several system improvements have to be made to recover the lost(1),including the use of low-loss low-nonlinearity(2),Raman amplification,and stronger error correction.
(1)
A.noise   
B.SNR   
C.speed   
D. eeor
(2)
A.optical fiber   
B.traffic   
C.internet   
D.signaling


相關(guān)試題

推薦文章