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http://img.dmitory.com/img/201805/5yb/x16/5ybx16ALrq4QK6OKOK4Q4S.jpg
http://img.dmitory.com/img/201805/6EH/6La/6EH6LaJ8kwmW0QoeQwou2y.jpg
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표준 단위 생각하면서 내려왔는데 국제 표준 단위랰ㅋㅋㅋㅋㅋㅋㅋㅋ