两端面积:公式:πr²½273=136.5(mm),π×136.5²=18632.25π(mm²)内表面积:公式:2πr²×(h×πd)27mm=0.273m,11mm=0.011m,0.273-0.11×2=0.251(m),½0.251=0.1255(m),2×π...
两端面积:公式:πr²½273=136.5(mm),π×136.5²=18632.25π(mm²)内表面积:公式:2πr²×(h×πd)27mm=0.273m,11mm=0.011m,0.273-0.11×2=0.251(m),½0.251=0.1255(m),2×π...