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Φ20=2.47Kg直徑為d的鋼筋的理論重量=d^2/100*0.617=d^2X0.00617 ^2為平方,0.617為直徑為10鋼筋的理論重量,只需要記住10鋼筋的理論重量即可!直徑12及以下的保留三比特小數;直徑12以上的保留兩位小數;保留時候6舍7…
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