통신영어 및 교통지리전파전자통신기사 · 2016년10월08일 · 64/100
64.Which of the following term is most improper?
1
Radio - A general term applied to the use of radio waves
2
Communication - Telecommunication by means of radio waves정답
3
Waves or hertzian waves - Electromagnetic waves of frequencies arbitrarily lower than 3,000[GHz], propagated in space without artifical guide
4
Telecommunication - Any transmission, emission or reception of signs, signals, writings, images and sounds or intelligence of any nature by wire, radio, optical or other electromagnetic systems