單項(xiàng)選擇題

由曲線y=x2/2和直線x=1,x=2,y=-1圍成的圖形,繞直線y=-1旋轉(zhuǎn)所得旋轉(zhuǎn)體體積為:()

A.(293/60)π
B.π/60
C.4π2
D.5π