发布时间:2025-01-24 10:59:40
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。
bosch 博世 gsb 10 re set 冲击钻 插电式手电钻工具箱 100附件套装
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