A:told
B:tells
C:was told
下列海域中,属于我国内海的是
____ ____you know that girl. She's in your class.
如图,在Rt△ABC中,∠C=90°,AC=3.将其绕B点顺时针旋转一周,则分别以BA、BC为半径的圆形成一圆环.该圆环的面积为( )