<p>2D도면작성- 도형의 표시방법(1)<br></p><p><br></p><p><a href="https://www.youtube.com/watch?v=sDZdAqse4DM&amp;feature" target="_blank">https://www.youtube.com/watch?v=sDZdAqse4DM&amp;feature</a><br></p>