题干
—How long has Mr Wang worked in the factory?
— 15 years．
A：Since．
B：For
C：In
D：To
答案(点此获取答案解析）
B
—How long has Mr Wang worked in the factory?
— 15 years．
A：Since．
B：For
C：In
D：To
2SO3(g)，进行到4min时，测得n (SO2) = 0.4mol,若反应进行到前2min末时，容器中n (SO2)为
