A:Having defeated
B:To have defeated
C:Having been defeated
D:To have been defeated
如图所示,A,B两物体在同一点开始运动,从A,B两物体的位移﹣时间图线可知下列说法中正确的是( )
1954年制定的《中华人民共和国宪法》是我国第一部资产阶级共和国宪法。错误:____ 改正:____
***《沁园春·雪》中的“只识弯弓射大雕”中的“一代天骄”是指____。
已知一个多边形的外角和等于它的内角和,则这多边形是( )