半径=2.85除以2除以3.14约等于0.5米V=SH=3.14乘以0.5的平方乘以1.1=0.8635立方米M=2乘以863.5=1727斤
πd=2.85d=2.85/π面积=（d/2）²*π=1.425*1.425/π=0.647平米体积=0.647*1.1=0.7117立方米=711.7公斤
