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平和:油管的截面积计算方法:以73油管为例:首先计算0.073*0.073/4*3.14=0.00418平方米蔀葑为62mm,0.062*0.062/4*3.14=0.00302平方米 ..(2009-09-22 21:23)嬀/color]
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