单项选择题
A.≤5Ω B.≤10Ω C.＜5Ω D.＜10Ω
A.3/4〞馈线 B.1/2〞馈线 C.7/8〞馈线 D.1/2〞超柔馈线
A.denseurban B.move in open areaat the speed of120km/h C.near shopping mall D.in office building