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【Daily Topic】【Electrical Edition 20170220】

2017-02-21View Original

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Participation reward: 2 Wealth. Correct reward: 8 Wealth. Multiple-choice question: At present, the **power grid company has established a power backbone communication network with ’three verticals and four horizontals’, creating a communication network structure that is based on fiber optic communication, with various other communication methods existing alongside it. A. Ultrasonic waves, carrier wave B. Infrared rays, microwaves C. Microwaves, carrier wave D. Electromagnetic waves, carrier wave C

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