M25****810 2021-08-14 14:43 开发者_开发技巧 首先干冰就是固体二氧化碳x0d二氧化碳是看不到的,其实那也不是烟,是雾,二氧化碳由固体变成气体时吸收大量的热,使周围空气的温度降的很快,空气温度降了,他对水的溶解
I have map (openstreetmap project) with many buildings. Each building is a polygon. How can I make saddle roof parts polygons for every building outline?
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