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【简答题】

某石英砂滤池有4格,设计过滤速度为9m/h, 其中当某一格反冲洗时,其它3格的平均过滤速度为( )。(只需答案,无需计算过程)

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参考解析:
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【多选题】滤池的承托层位于石英砂滤料下面,其主要作用有哪些( )?

A.
过滤时,防止滤料从配水系统中流失
B.
过滤时,维持过滤速度相对均衡
C.
反冲洗时,均匀分布反冲洗水
D.
反冲洗时,减缓滤层反冲洗强度。

【单选题】When stars like our Sun die, they bloat to become red giants and then eject gigantic clouds of gas and dust into space. Increasingly, however, scientists found themselves at a profound loss to explain...

A.
explain-the possible way of death of our Sun.
B.
show the two types of red giants.
C.
discuss on the way of red giants to become white dwarfs.
D.
explore the origin of life.

【单选题】石英砂作为过滤滤料,也存在一些不足,主要是

A.
颗粒不均匀
B.
不干净
C.
表面带负电荷
D.
颗粒表面形状不规则

【单选题】柱色谱中石英砂的作用

A.
美观
B.
方便辨认
C.
压实硅胶
D.
防止溶液冲击
相关题目:
【多选题】滤池的承托层位于石英砂滤料下面,其主要作用有哪些( )?
A.
过滤时,防止滤料从配水系统中流失
B.
过滤时,维持过滤速度相对均衡
C.
反冲洗时,均匀分布反冲洗水
D.
反冲洗时,减缓滤层反冲洗强度。
【单选题】When stars like our Sun die, they bloat to become red giants and then eject gigantic clouds of gas and dust into space. Increasingly, however, scientists found themselves at a profound loss to explain...
A.
explain-the possible way of death of our Sun.
B.
show the two types of red giants.
C.
discuss on the way of red giants to become white dwarfs.
D.
explore the origin of life.
【单选题】石英砂作为过滤滤料,也存在一些不足,主要是
A.
颗粒不均匀
B.
不干净
C.
表面带负电荷
D.
颗粒表面形状不规则
【单选题】柱色谱中石英砂的作用
A.
美观
B.
方便辨认
C.
压实硅胶
D.
防止溶液冲击