A:通入大量O2
B:增大容器容积
C:移去部分SO3
D:降低体系温度
A. I often paint pictures. B. I like winter best.
C. We go to the park at 7:00 a. m. D. Because there are beautiful flowers.
矩形纸片ABCD的边长AB=8,AD=4,将矩形纸片沿EF折叠,使点A与点C重合,折叠后在某一面着色(如图),则着色部分的面积为( )