Microwave communication uses high-frequenc

题型:单项选择题

问题:

Microwave communication uses high-frequency (71) waves that travel in straightlines throughthe air. Because the waves cannot (72) with the curvature of the earth, they can be (73) only over short distance. Thus, microwave is a good (74) for sendingdata between buildings ina city or on a large college campus. For longer distances, the wavesmust be relayed by means of"dishes" or (75) . These can be installed on towers, highbuildings, and mountain tops.

A.repeaters

B.radars

C.telephones

D.antennas

考点:计算机软件水平考试初级网络管理员初级网络管理员上午试题
题型:单项选择题

(2011•淮安)在菱形ABCD中,AB=5cm,则此菱形的周长为(  )

A.5cm

B.15cm

C.20cm

D.25cm

题型:单项选择题

某班历史兴趣小组研究“中国新民主主义革命的特点”这一课题,收集以下的相关史料:

①太平天国运动          ②抗日战争         ③中共诞生        ④维新变法运动      ⑤五四运动           ⑥辛亥革命

你认为符合该课题研究的史料(    )                                                      

A.①②④

B.①④⑥

C.①③

D.②③⑤

题型:单项选择题

甲在暂缓执行行政拘留期间,给证人乙2000元钱,让乙向复议机关提供假证词,后被发现。对此种情况,公安机关决定没收甲的保证金,并恢复执行行政拘留。该公安机关的做法是正确的。()

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