4. %EC%BD%98%ED%81%AC%EB%A6%AC%ED%8A%B8 %EA%B2%BD%EC%82%AC%EC%A7%80%EB%B6%95 ZINC %EA%B8%B0%EC%99%80 %EC%8B%9C%EA%B3%B5%EC%82%AC%EB%A1%80