In the following essay, each blank has four choices. Choose the best answer and write-down on the answer sheet. Microwave com

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问题 In the following essay, each blank has four choices. Choose the best answer and write-down on the answer sheet.
Microwave communication uses high-frequency(71)waves that travel in straightlines through the 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 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(75). These can be installed on towers, highbuildings, and mountain tops.

选项 A、optical
B、radio
C、electrical
D、magnetic

答案B

解析

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本试题收录于：网络工程师上午基础知识考试题库软考中级分类

网络工程师上午基础知识考试

软考中级

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In the following essay, each blank has four choices. Choose the best answer and write-down on the answer sheet. Microwave com

网络工程师上午基础知识考试

软考中级

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