DN150é¢ç®¡å¤å¾ä¸º159 mm = 1.59 dmï¼å£å5.0ï¼å
å¾ä¸º159-5Ã2 = 149 (mm) = 1.49 dm
é¢ç®¡æªé¢ç§¯(m^2)ï¼A = Ï/4(1.59^2-1.49^2)
æ¯ç±³(L=10dm)é¢ç®¡ä½ç§¯(m^3)ï¼V = AÃL = Ï/4(1.59^2-1.49^2)Ã10
é¢ç®¡å¯åº¦ï¼7.85 kg/m^3
æ¯ç±³è´¨éï¼ééï¼ï¼m = 7.85V = 7.85ÃÏ/4(1.59^2-1.49^2)Ã10 = 18.989 kg = 0.018989 t
æ¯å¨é¿åº¦ï¼1 / 0.018989 = 52.66 m
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