国际上主流的3G标准有三个:即(),欧洲标准;(),美国标准;(),中国提出的标准。
参考答案:WCDMA;CDMA2000;TD-SCDMA
补全对话,每空一词。
W: Hi, Mary. Are you going to go 1_________ us this afternoon?
M: 2_________ are you going?
W: Uncle Wang's house.
M: Really? But it's far 3_________ here. 4_________ do we get there?
W: We can get there 5_________ bus.
M: Good idea.Which bus shall we 6_________?
W: No. 35 bus.
M: Oh, how 7_________ does it take?
W: About 20 minutes.
M: OK. 8_________ 9_________ are we going to meet?
W: At 11:30.
M: And 10_________?
W: Outside our school gate (大门).
射频电缆应选用()应指明用于什么.
A、150欧同轴电缆
B、100欧同轴电缆
C、50欧同轴电缆
D、75欧同轴电缆