发布时间:2025-01-30 04:58:57
圆钢重量的计算公式是
πD^2Hρ/4
=0.785D^2Hρ
其中D——圆钢直径
H——圆钢长度
ρ——圆钢密度 一般取7.85
若直径长度的单位是mm,公式为 0.785×7.85D^2H/1000000 (6个零),得到重量的单位是kg
园林绿化三级养护各项价格标准如草坪灌木等每月47面积47花费多少要国家标准的或江西省的
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