A.檢驗(yàn)光纜及器材的性能B.確認(rèn)光纜及器材的數(shù)量C.訓(xùn)練隊(duì)伍D.分清光纜及器材質(zhì)量的責(zé)任方
A.直埋B.架空C.管道D.水底
A.光端機(jī)B.電端機(jī)C.半導(dǎo)體光源