A.傳輸?shù)墓β蕦?、通信容量?br /> B.傳輸損耗大 C.不受電磁干擾 D.質(zhì)量輕
A.VPWS、流、tunnel B.流、VPWS、tunnel C.tunnel、VPWS、流 D.tunnel、流、VPWS
A.衰減、色散 B.色散、非線效應(yīng) C.衰減、非線效應(yīng) D.衰減、色散、非線效應(yīng)