发布时间:2025-01-30 16:37:37
等于体积*比重;6.5mm的米重,体积0.65平方*3.14/4*100=33.166,铁的比重为7.85,
则:33.166*7.85=260.355g(0.261kg/米),每延米0.261kg。
富安娜家纺床上用品纯棉全棉学生宿舍被罩北欧风新品纯色单件被套
2025-01-30 16:37:37 2025-01-30 16:37:37 2025-01-30 16:37:37 2025-01-30 16:37:37 2025-01-30 16:37:37 2025-01-30 16:37:37 2025-01-30 16:37:37 2025-01-30 16:37:37 2025-01-30 16:37:37 2025-01-30 16:37:37甲乙二人比赛爬楼梯假跑到三层时以恰好跑到二层照这样计算 甲跑到11层时乙跑到几层
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