A.單徑傳播 B.多徑傳播 C.頻率衰耗 D.頻率變化
A.90%,1,0.2% B.85%,0.9,0.3% C.95%,1,0.4%
A.129.20.3.1 B.127.30.2.3 C.193.100.12.1 D.224.0.1.1