7.下列三角形:①有两个内角是60°的三角形;②有两边相等且是轴对称的三角形;③有一个角是60°且是轴对称的三角形;④一腰上的中线也是这条腰上的高的等腰三角形.其中是等边三角形的有( )
0 286808 286816 286822 286826 286832 286834 286838 286844 286846 286852 286858 286862 286864 286868 286874 286876 286882 286886 286888 286892 286894 286898 286900 286902 286903 286904 286906 286907 286908 286910 286912 286916 286918 286922 286924 286928 286934 286936 286942 286946 286948 286952 286958 286964 286966 286972 286976 286978 286984 286988 286994 287002 366461
| A. | ①②③ | B. | ①②④ | C. | ①③④ | D. | ②③④ |