为参加毕业晚会,小敏用圆心角为120°,半径20cm的扇形纸片围成一顶圆锥形的帽子,若小敏的头围约60cm,她戴这顶帽子大小合适吗?( )(填“合适”或“不合适”)
不合适
Hill often attends lectures at Nanjing University , chiefly ____ his knowledge about hobbies .
A.to acquire
B.for improving
C.to advance
D.by increasing
下列哪些是肛提肌收缩力的作用()
A.内旋转
B.仰伸
C.衔接
D.有助于胎盘娩出
E.以上均不正确