质量=体积*密度
铁管的底面积=pi*[0.045*0.045-(0.045-0.02)*(0.045-0.02)]=0.0044㎡
所以,铁管的体积就是0.0044立方米
铁的密度是7900kg/立方米
所以,重量=7900*0.0044=34.76kg
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