发布时间:2025-01-20 03:09:42
钢筋: (300*4/1000)+(1.5*4/1000)=3.6吨
混凝土:(300*4*1.2/10000米)+(1.5*4/10000米)=3.84吨
(300*4+1.5*4)*25kg/㎡=30.0吨
石头:30吨
沙子: 7.5 吨
chnt47正泰 nxb631pc20家用空气开关 20a 全方位保障家庭用电安全
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