We need a _________ of ten people to play this game.
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The busy traffic entrance was a __________ to pedestrians.
The factory closure is __________ inevitable.
虹吸滤池是由( )格单元滤池所组成的一个过滤整体,称为“一组(座)滤池”
A. 1-5
B. 6-8
C. 9-12
D. 13-16
V形滤池是一种快滤池,其命名是因滤池两侧(或一侧也可)进水槽设计成( )
A. W形
B. V 形
C. A形
D. I形