若利用房间内的窗户和走廊内的窗户及排烟口进行自然排烟,其面积不应小于房间或走廊面积的()
A.2%
B.5%
C.5%至10%
参考答案:A
With a report _____ about the accident, the policeman has to find some witnesses for help.
A.write
B.writing
C.written
D.to write
我国新闻事业遵循的“二为”方针是什么