问题
填空题
国内常用的抽放瓦斯设备主要有离心式鼓风机、回转式鼓风机和()。
答案
参考答案:水环式真空泵
国内常用的抽放瓦斯设备主要有离心式鼓风机、回转式鼓风机和()。
参考答案:水环式真空泵
根据对话内容,从方框内的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。 Brian: Hi, Cindy. 小题1: Cindy; Hi, Brian. It is nice to sec you and somany old classmates. Brian: So it is. 小题2: Cindy: You're right. It's really a long time. Brian: Did you see the old photos on the wall? Cindy: I sure did.小题3: Brian: But those are some great memories. Cindy: Hey!小题4: Brian. Yes, it is. I remember he used to stay upall night studying. Cindy: 小题5: Brian: Yes. He was the only one left in the classwhen he woke up. Cindy: That was really funny.
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