The inspector asked the restaurant to replace the filter on the air extractor .
监察员要求餐馆更换排气扇的过滤网。
The utility model discloses a sowing barrel with an inner air extractor pulled by a bearing which is mounted on a gas pipe axle connected with an air pump.
本实用新型公开了一种内置气吸式播种滚筒，它由轴承带动转 动。
Air accumulation in the condenser owing to insufficient output of air extractor can increase the terminal temperature difference and the air pressure component.
抽气器出力不足而引起的空气在凝汽器内积聚，使得凝汽器端差和空气分压力均增大，对凝汽器真空造成双重影响。
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