切勿将卡式炉的安全装置及气体流动的部分（）。
A、合用
B、脱离
C、合并
D、隔开
参考答案：B
公安机关的权力又称为公安机关的权限。
用所给单词的适当形式填空
1. Mr Green (appear) in over 40 movies so far.
2. The great poet Yu Guangzhong has written lots of p____．
3.The young man is the lead (sing) in the band.
4. Be sure____ (send)my best wishes to your parents.
5. We must help those (home) children because of the earthquake.
