A.近端串?dāng)_/衰減 B.衰減/近端串?dāng)_ C.近端串?dāng)_-衰減 D.衰減-近端串?dāng)_
A.110 B.113 C.114 D.133
A.傳輸損耗高 B.傳輸頻帶低 C.抗干擾性強 D.安全性能低