汽包检修工作完毕后，关闭人孔门前应注意什么？
参考答案：
汽包检修工作完毕后，工作负责人应清点人员和工具，检查确实无人或工具留在汽包内，方可关闭人孔门。
The police _____ the murderer everywhere when he suddenly appeared in a theatre. [ ]
A. is searching for
B. were searching for
C. are searching for
D. were searching
中国革命博物馆的前身是（），成立于（）年3月。
