第1365题：eccentricity
The eccentricity of a conic section is 0.4, The conic section must be( )
A. a circle
B. an ellipse
C. a parabola
D. a hyperbola
安卓手机扫描二维码安装App第1365题：eccentricity
The eccentricity of a conic section is 0.4, The conic section must be( )
A. a circle
B. an ellipse
C. a parabola
D. a hyperbola
苹果手机扫描二维码安装App