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【单选题】
Which of the listed pressure control valves would be used to establish the maximum operating pressure of a hydraulic system?A.
Pressure-reducing valve
B.
Unloading valve
C.
Counterbalance valve
D.
Pressure-relief valve
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【单选题】Concerning the management of sewage treatment plant using activated sludge, which of the following is correct?
A.
the plant should be prohibited to supplying air
B.
the plant should work at intervals
C.
the plant should be added disinfector in time
D.
we should check strength of activated sludge, ivory-white color is best
【简答题】活性污泥( activated sludge )
【单选题】Concerning the management of sewage treatment plant using activated sludge, which of the following is correct?
A.
The plant should be prohibited to supply air
B.
The plant should work at intervals
C.
The plant should be added disinfector in time
D.
We should check strength of activated sludge, ivory-white color is best.
【单选题】修辞同语音、词汇、语法的关系是（）。
A.
并列关系
B.
从属关系
C.
支配与被支配的关系
D.
既不并列也不从属，修辞是从表达方式、表达效果的角度去研究语音、词汇、语法的运用的
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