分散排风系统的特点是（）。
A．系统风管较短
B．布置简单
C．系统压力容易平衡
D．初投资大
参考答案：A, B, C
用所给单词的适当形式填空
1. He likes painting. He________(want) to be an artist.
2. They want to join the________ (swim) club.
3. The cat can________ (be) Lily's.
4. Mike wants _______ (play) baseball.
5. I can help_________(kid) with singing.
6. Come and join_________ (we).
住宅的卧室，窗户可开启的部分应是( )m2。
A．1B．1.2C．1.5D．1.8
