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【多选题】
下列关于活性污泥的描述中哪些是正确的?A.
活性污泥进入内源呼吸期后其增殖速率高于自身氧化速率。
B.
活性污泥对污染物的净化过程通常需要经历初期吸附和微生物代谢两个净化阶段。
C.
混合液挥发性悬浮固体浓度(MLVSS)较混合液悬浮固体浓度(MLSS)阶段更能确反映活性污泥中活性部分的数量。
D.
污泥容积指数(SVI)可以反映出活性污泥的凝聚、沉淀性能，污泥容积指数（SVI）值过低，说明活性污泥缺乏活性；过高，说明污泥有膨胀趋势或已有产生膨胀现象。
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举一反三
【单选题】After the SSP being checked by a duly authorized officials of a port State, whom should be reported to by the ship immediately?
A.
Port State
B.
Flag state
C.
The CSO
D.
The Administration
【单选题】About the " Port State Control Officer (PSCO)", the incorrect statement is______.
A.
the person duly authorized by the competent authority of a Party to a relevant convention to carry out Port State Control inspections
B.
the person is responsible exclusively to that shipowner
C.
the person is responsible exclusively to that Party
D.
in China, the PSCO is from China MSA
【单选题】If a port configured with STP loop guard stops receiving BPDUs， the port will be put into which state？（）
A.
learning state
B.
listening state
C.
forwarding state
D.
root-inconsistent state
【简答题】相克关系中,克我者为所不胜;我克者为 。
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