档案室收发档案材料的门洞及窗口应安装防火门窗，其耐火极限不得低于（）
A.0.25h
B.0.5h
C.0.75h
D.1h
参考答案：C
---________ are you going?
--- I'm going to the reading room. I'd like to read the book" The Three Kingdoms". [ ]
A. When
B. How
C. Where
D. Why
执行异议
