2. 计算机
  3. Microwave communication uses high-frequency (1)______ waves that travel in straightlines throughthe air. Because the waves cann

Microwave communication uses high-frequency (1)______ waves that travel in straightlines throughthe air. Because the waves cann

admin2013-01-05  41
问题 Microwave communication uses high-frequency  (1)______ waves that travel in straightlines throughthe air. Because the waves cannot  (2)______with the curvature of the earth, they can be  (3)_____only over short distance. Thus, microwave is a good  (4) ______for sendingdata between buildings ina city or on a large college campus. For longer distances, the wavesmust be relayed by means of"dishes" or  (5)_____. These can be installed on towers, highbuildings, and mountain tops.
(4)______
A．material
B．equipment
C．medium
D．Channel
选项 A、 
B、 
C、 
D、 
答案C
解析
转载请注明原文地址:https://jikaoti.com/ti/4Id7FFFM
本试题收录于： 网络管理员上午基础知识考试题库软考初级分类
0

网络管理员上午基础知识考试

软考初级

相关试题推荐
随机试题
最新回复(0)