发布时间:2025-01-20 03:04:25
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
我家孩子在长春后现代画室学美术当时学校承诺不下证给退一部分学费但是现在老师以没签协议为由不给退
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