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【多选题】
在湿地系统中,填料是植物的载体,是微生物的生长介质,它将湿地中发生的所有处理过程一个整体。基质还能够通过沉淀、过滤和吸附等作用直接去除污染物。对于填料的配置, 主要考虑其种类、、深度等, 特别需要关注对磷的去除能力。A.
种类
B.
对磷的去除能力
C.
D.
深度
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皮皮学刷刷变学霸
举一反三
【单选题】What does the author most probably think of the content-based learning?
A.
He doubts it.
B.
He supports it.
C.
He thinks it funny.
D.
He finds it impractical.
【单选题】What does the expression 'fall flat' in the last paragraph probably mean based on the context?
A.
serve their function
B.
fail to take effect
C.
meet the expected demands
D.
dropped down and broken into pieces
【单选题】Based on the figure, does S depend on the frequency of a sound wave of a given intensity?
A.
Yes, because as frequency increases, S increases.
B.
Yes, because as frequency increases, S remains constant.
C.
No, because as frequency increases, S increases.
D.
No, because as frequency increases, S remains
【单选题】Questions are based on the following passage. 'Innovative' does not necessarily mean radical or expensive， nor do the best ideas comefrom the top. A woman on the shop floor at Ford suggested putting s...
A.
everything that is beneficial to people can be said to be innovative
B.
even the common people can put forward an innovative suggestion
C.
people are easy to accept new things that are helpful to them
D.
the ideas from the top sometimes are not as good as those from ordinary people
【单选题】In a gold-based alloy，copper does which of the following( )
A.
prevents corrosion
B.
increases malleability
C.
increases hardness
D.
A and B
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