手机软件$25 https://www.buildcalc.com/wp-content/uploads/2022/10/Manual.2.1.7.1.pdf，我买了个二手计算器同样价格。手册：https://www.itm.com/pdfs/cache/www.itm.com/4065/manual/4065-manual.pdf
roof视频：https://www.youtube.com/watch?v=P0USmxLAHtA
海外博客
屋顶的木工计算
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