<p>조립부품준비(선반가공) - [인천소방고] 나사가공<br></p><p><br></p><p><a href="https://www.youtube.com/watch?v=MMEX-0x4lqI" target="_blank">https://www.youtube.com/watch?v=MMEX-0x4lqI</a><br></p>