2.北美T-1系統的基本速率(或稱線速(ine speed)為何?
(A)1Mbps
(B)1.38 Mbps
(C)1.544 Mbps
(D)2 Mbps

答案:登入後查看
統計: A(13), B(22), C(196), D(10), E(0) #2407711