髋关节具有（）
A.关节唇
B.关节盘
C.囊内韧带
D.囊外韧带
E.滑膜囊
参考答案：A, C, D
An ________ boy came to our class yesterday.
A．11-year-old
B．11-years-old
C．11-year old
D．11 years old
正九边形绕它的旋转中心至少旋转______°后才能与原图形重合．
