V=48*3.14*(51/2)^2=6160.1CM^3
M=V*1=6160.1g=6.160.1公斤=0.00616吨
如果你原来的单位是米,则
V=48*3.14*(51/2)^2=6160.1M^3
M=V*1=6160.1g=6160.1吨