A:He went sightseeing.
B:He visited art museums.
C:He bought some paintings.
umbrella
我的祖国民族自治区及首府4个。( )
已知双曲线x2m-y2n=1mn>0的离心率为2,有一个焦点恰好是抛物线y2=4x的焦点,则此双曲线的渐近线方程是 ( )