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It's rather windy today. Put on some warm clothes, _________ you'll catch a cold.
一块长方形铁皮长为4dm,宽为3dm,在四角各截去一个面积相等的正方形,做成一个无盖的盒子,要使盒子的底面积是原来铁皮的面积一半,若设盒子的高为xdm,根据题意列出方程,并化成一般形式.
地球自转与公转的周期分别是( )
下面四个图形中,∠1与∠2是对顶角的图形的个数是( )