<p>2D도면작성 - 물체의 투상법<br></p><p><br></p><p><a href="https://www.youtube.com/watch?v=4S-JkD3RORU&amp;feature" target="_blank">https://www.youtube.com/watch?v=4S-JkD3RORU&amp;feature</a><br></p>