问题
单项选择题
局部通风机安装位置要合理，全风压供给的风量要适当，最重要的是要避免产生（）。
A.串联风
B.循环风
C.污浊风
D.上行风
答案
参考答案：B
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局部通风机安装位置要合理，全风压供给的风量要适当，最重要的是要避免产生（）。
A.串联风
B.循环风
C.污浊风
D.上行风
参考答案：B
| 情景交际：从方框中选择出合适的选项完成对话。 | |
| A: Let's play basketball. B: No, it's boring. A: Then let's go to the movies. B: That sounds interesting. 1______ A: 2______ But I don't like thrillers. It's too scary. What about you? B: I like comedies best. 3______ And I also like Beijing Opera. A: Me too. 4______ B: 5______ She wants to be a Beijing Opera artist.
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