第一次算鋁管的重量，請(qǐng)教是否正確

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                       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

  第一次算鋁管的重量,，請(qǐng)教是否正確,，我算出的重量是18.1kg，謝謝�,。,。。,。,。。,�,！