题干
— Are you Helen?
— ________________.
A：Yes, I'm.
B：No, I'm not.
C：Yes, you are.
D：No, you aren't
答案(点此获取答案解析）
B
— Are you Helen?
— ________________.
A：Yes, I'm.
B：No, I'm not.
C：Yes, you are.
D：No, you aren't
4NO+6H2O在5L的密闭容器中进行，30s后，NO的物质的量增加了0.3mol，则此反应的平均速率为