题干
It seems that it is going to rain. You'd better ________ the windows open when you leave the house.
A：not leave
B：leave
C：not to leave
D：to leave
答案(点此获取答案解析）
A
4NO(g) + 6H2O(g)在5L密闭容器中进行，半分钟后，NO的物质的量增加了0.3mol，则表示此反应的速率正确的是（ ）