A:0.8mol
B:0.4mol
C:0.4mol<x<0.8mol
D:<0.4mol
⑴This is a photo of Hainan. ____
⑵I got to school by car yesterday.____
⑶Beijing is in the north of China.____
⑷The mountains are really beautiful.____
⑸I went to England last year.____
光的世界十富多彩,光学器件在我们的生活中、学习中有着广泛应用.下列说法符合实际的是( )
俗话说:“三个臭皮匠,顶个诸葛亮”。说明我们要学会( )