2. 计算机
  3. Microwave　communication　uses　high-frequency(56)waves　that　travel　in　straightlines　through　the　air.　Because　the　waves　cannot(57)w

Microwave　communication　uses　high-frequency(56)waves　that　travel　in　straightlines　through　the　air.　Because　the　waves　cannot(57)w

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问题 Microwave　communication　uses　high-frequency(56)waves　that　travel　in　straightlines　through　the　air.　Because　the　waves　cannot(57)with　the　curvature　of　the　earth,　they　can　be(58)only　over　short　distance.　Thus,　microwave　is　a　good(59)for　sending　data　between　buildings　in　a　city　or　on　a　large　college　campus.　For　longer　distances,　the　waves　must　be　relayed　by　means　of　　"dishes"　or(60).These　can　be　installed　on　towers,　high　buildings,　and　mountain　tops.
选项 A、material
B、equipment
C、medium
D、channel
答案C
解析
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