四级四级网络工程师网络工程师全真模拟试卷(二)上午试题
题目内容

●In the following essay,each blank has four choices.Choose the best answer and write down on the answer sheet.Microwave communication uses  (66)  -frequency radio waves that travel in straightline sthrough the air.Because the waves cannot  (67)  with the curvature of the earth,they can be  (68)  only over short distance.Thus,microwave is a good  (69)  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  (70)  .These can be installed on towers,highbuildings,and mountain tops.

2024-07-10

A.high

B.low

C.long

D.short

题目答案

试卷相关题目

最新试卷
热门试卷

长理培训客户端 资讯,试题,视频一手掌握

去 App Store 免费下载 iOS 客户端