336x280(권장), 300x250(권장), 250x250, 200x200 크기의 광고 코드만 넣을 수 있습니다.
http://hanbitbook.co.kr/web/sample/1309/Database_chapter3.pdf
https://www.google.co.kr/url?sa=t&rct=j&q=&esrc=s&source=web&cd=41&ved=0CC0QFjAAOCg&url=http%3A%2F%2Fswpju.tistory.com%2Fattachment%2F493488452718690.pdf&ei=a0cUUdLsD9G0iQezxIDoAg&usg=AFQjCNEjFUo19oYtYAnskO2FVW95JGwZMQ&bvm=bv.42080656,d.aGc&cad=rjt
https://www.google.co.kr/url?sa=t&rct=j&q=&esrc=s&source=web&cd=43&ved=0CDsQFjACOCg&url=http%3A%2F%2Fdbrang.tistory.com%2Fattachment%2F490e6bd9cb0c89X.pdf&ei=a0cUUdLsD9G0iQezxIDoAg&usg=AFQjCNHRYk7qCv5ymPjHSz-8-7hLwDlGDg&bvm=bv.42080656,d.aGc&cad=rjt
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