CRH380AL型动车组空调换气系统由空调装置、换气装置、通风装置、_爱下问搜题

搜题请搜索小程序“爱下问搜题”

问题单项选择题

CRH380AL型动车组空调换气系统由空调装置、换气装置、通风装置、（）及送回风风道系统组成。

A.加热器

B.应急通风装置

C.司机空调

D.送风机

答案

参考答案：B

填空题

根据句意，从方框中选择恰当的词或短语填空(每词限用一次)。

Lucky, instead of, tasty, leaves, unpopular, a good sense of humour, beginning

1. Pingping has _________ and often makes us laugh.
2. A good                is half done.
3. The                of trees are turning yellow in autumn.
4. Are there any                dishes on the table?
5. I don't like this song. Because it's _________ now.
6. He will watch TV _________ doing his homework tonight.
7. It's                for me to pass all the exams.

问答题简答题

简述YC6LN-50系列气体发动机的电子节气门的工作原理及作用。