핸드폰이 어떻게 작동할까?

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Channel: Lesics 한국어
Views: 113,670
Rating: undefined out of 5
Keywords: 무선 통신, 광섬유 케이블
Id: -PybfAJUOYY
Channel Id: undefined
Length: 8min 16sec (496 seconds)
Published: Sat Mar 16 2019
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