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常用钢材理论重量简易计算方法
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1 =0.00617**
2 =0.00785**
3 =0.0068**
4 =0.0065**
5 =0.00617**
6 =0.00785*+-*
7 =0.00785**
8 =0.02466**-
9 =0.02466**-
10 =7.85*
11 =7.85*