https://blog.gongquiz.com/2021/05/05/%ea%b5%ac%ed%98%95%ed%83%b1%ed%81%ac%ec%9d%98-%ec%9a%a9%ec%a0%81%ec%9d%b4-1000m3%ec%9d%b8-%ec%a0%80%ec%9e%a5%ed%83%b1%ed%81%ac%ec%97%90-%eb%b9%84%ec%a4%91%ec%9d%b4-0-6%ec%9d%b8-lpg%eb%a5%bc-%ec%a0%80/