A.基本語音B.中速數(shù)據(jù)業(yè)務(wù)C.穿戴設(shè)備D.高速數(shù)據(jù)業(yè)務(wù)
A.2 B.3 C.4 D.5
A.電信網(wǎng) B.互聯(lián)網(wǎng) C.VR/AR D.5G