ȯδ Ρüȸ ϰ ϰ ֿ õ ȭå ȹ̶ Ѵ.
ֿ õ Ȯ롤ȭϰ ż 躰 ϴ å(T/F) ̸ Ѵٰ Ѵ.
ý ü ȸ Ǵ õȭ ķ Ȯ ȹ̶ ߴ.
ڷ ٷΰ : http://www.waterjournal.co.kr/news/articleView.html?idxno=19847