发布时间:2025-01-24 10:36:46
因为剩下部分和原来的表面积都是由两个正方形和四个侧面组成,用138-98便得到了锯下的正方体的四个侧面的面积,40.正方体六个面相等,一个面就是10平方米。所以锯下的正方体表面积就是60平方米。
各规格 方钢的壁厚国标 150150 8040 4040 2040
2025-01-24 10:36:46 2025-01-24 10:36:46 2025-01-24 10:36:46 2025-01-24 10:36:46 2025-01-24 10:36:46 2025-01-24 10:36:46 2025-01-24 10:36:46房间里因为有过梁想挂两只萧在两边顶一下但不知道怎么挂是直着挂还是可以斜着
2025-01-24 10:36:46 2025-01-24 10:36:46 2025-01-24 10:36:46 2025-01-24 10:36:46 2025-01-24 10:36:46 2025-01-24 10:36:46 2025-01-24 10:36:46 2025-01-24 10:36:46 2025-01-24 10:36:46工人师傅用如图的铁皮做了一个水箱将水箱内外壁刷防锈漆要刷多少平方米
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