표지 책등 계산법

[mk_image src=”https://daworks.org-content/uploads/2014/08/표지-쎄네카-두께-계산방법.jpg” image_width=”800″ image_height=”350″ crop=”false” lightbox=”true” frame_style=”simple” link=”https://daworks.org-content/uploads/2014/08/표지-쎄네카-두께-계산방법.pdf” target=”_blank” caption_location=”inside-image” align=”left” margin_bottom=”10″]