A.20%~30% B.30%~40% C.40%~50% D.50%~60%
A.25%~50% B.30%~60% C.40%~70% D.50%~80%
A.2芯光纜 B.4芯光纜 C.6芯光纜 D.大對(duì)數(shù)通信電纜