【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.
【判断题】配对设计的四格表的卡方检验的无效假设为B=C
【单选题】Activated sludge is a ______ step.
【判断题】价值型投资人偏好本益比、帐面价值或其他价值衡量基准偏低的股票。