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外径24.5内径19.5长度84、铜管的公式怎么算
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外径24.5内径19.5长度84-假设单位是mm值= 3.14/4 *(2.45 & # 178；-1.95²)* 8.4 * 8.9g/cm & # 179；*单价(元/公斤)=129.11g*单价(元/公斤)=0.129*单价(元/公斤)。
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