题干
— ________ is the book sale?
— It's next week.
A：What
B：Who
C：Where
D：When
答案(点此获取答案解析）
D
— ________ is the book sale?
— It's next week.
A：What
B：Who
C：Where
D：When
2SO3(g)；已知反应过程中某一时刻，SO2、O2、SO3分别是0.2mol/L、0.1mol/L、0.2mol/L，当反应达到平衡时，可能存在的数据是
