A:反应后有气体单质生成
B:反应前后分子、原子种类均不变
C:反应后容器内的物质为纯净物
D:该反应可表示为3X + Y = 2Z
23-____=20
78-____=70
31-____=30
86-____=80
59-____=50
98-____=90
下面是一幅讽刺性漫画,作为标题,最恰当的一项是( )
First-class players of football must have excellent ball control, but it is not just _____ they do with their feet _____ counts.