两个圆的直径比是2:3,则这两个圆的周长比是请选择DCBA6b.d'g)b-d:n/p*g*V,h2e'N,e+L2x*N.[,y)M-b5u
面积比是请选择ABCD7~,Z4h-l)H)`2{'Y+v:g1d5o'N,e+L2x*N.[,y)M-b5u
A.2:3'N,e+L2x*N.[,y)M-b5u
B.2π:3π'N,e+L2x*N.[,y)M-b5u
C.4π:9π'N,e+L2x*N.[,y)M-b5u
D.4:9'N,e+L2x*N.[,y)M-b5u