幸福感是积极的心理状态，下列选项中不属于幸福感的三个层面的是（）
A.正性情绪状态
B.积极的心理机能
C.社会安宁
D.幸福和快乐
参考答案：D
根据中文提示完成下列句子。
1. I want to take a __________ (照片) for you.
2. The weather today is __________ (晴朗的).
3. Danny hurts his __________ (鼻子).
4. Playing chess is very __________ (难的).
5. Don't __________ (担心) I can help you.
喷雾干燥法FGD 系统主要哪几部分组成？
