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【简答题】
用于将事务处理写到数据库的命令是( ) A.insert B.rollback C.commit D.savepoint
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【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.
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