A.減少信號衰減 B.減少電磁干擾輻射 C.減少物理損壞 D.減少電纜的阻抗
A.6 B.12 C.15 D.18
A.127.13.214.254 B.305.299.13.1 C.227.405.13.112 D.105.14.155.12