第一次算铝管的重量，请教是否正确
6.016 inch ± ID x 0.25 inch ± wall x 80.5 inch ± Length Aluminum Core ID Tolerance of +0.011 inch ±/-0.018 inch ± Machined 9 inch ± in from each end of core Wall thickness tolerance +/- 0.025 inch ± for the remaining middle of core Core is straightened to 0.0048 inch ±/ft, centerless ground to 32 RMS finish then hard coat anodized to 1.7-2.3 MIL Thickness 6061-T6 Alloy Modulus of elasticity is 10,000 第一次算铝管的重量，请教是否正确，我算出的重量是18.1kg，谢谢！！！！！！！！
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