道路交通事故、火灾事故自发生之日起7日内，事故造成的伤亡人数发生变化的，应当及时补报。
参考答案：对
He_____ articles for our wall-newspaper these years, and he____ about thirty articles.
A．has written; wrote
B．has been writing; wrote
C．is writing; has been writing
D．has been writing; has written
现场组装的空调机，应做漏风量检测，对空气洁净度等级为( )级做全数检查。
A．N5～N9
B．N1～N5
C．N6～N9
D．N1～N6
