一个圆柱体的体积是3.14立方厘米,如果它的底面半径扩大2倍,高不变,体积是请选择ABCD1k4@*T)N4[.I5y9U(u8f1D.[*d+l;`(~+Z5F7C7D0Y
A.3.14立方厘米8f1D.[*d+l;`(~+Z5F7C7D0Y
B.6.28立方厘米8f1D.[*d+l;`(~+Z5F7C7D0Y
C.12.56立方厘米8f1D.[*d+l;`(~+Z5F7C7D0Y
D.18.84立方厘米8f1D.[*d+l;`(~+Z5F7C7D0Y