A:①②
B:③④
C:①③
D:②④
在天气预报中,污染指数0~50,表示空气质量状况( )
在Rt△ABC中,∠C=90°,AC=12,BC=5,将△ABC绕边AC所在直线旋转一周得到圆锥,则该圆锥的侧面积是 ( )
He won the match because he took the advantage of his height.