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【多选题】
活性污泥处理系统有效运行的基本条件是:A.
污水中含有足够的可溶性易降解有机物，作为微生物生理活动所必需的营养物质
B.
混合液中含有足够的溶解氧
C.
活性污泥在曝气悬浮状态，能够与污水充 分接触
D.
活性污泥连续回流，同时，还要及时地排出剩余污泥，使混合液保持一定浓度的活性污泥
E.
对微生物有毒有害作用的物质不超过其毒阈浓度
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举一反三
【单选题】—What does his mother look like? —_____． [ ]
A.
She's a doctor
B.
She's forty
C.
She's thin
D.
She works in a bank
【单选题】What does Simon's mother think of his present job?
A.
The pay is not bad.
B.
It is a great shame for a university graduate to do gardening.
C.
It is not bad as a hobby.
D.
It is a fine job, but Simon should get another job for a change.
【简答题】定义一个类,描述一个矩形,包含有长、宽两种属性,和计算面积方法。编写一个类,继承自矩形类,同时该类描述长方体,具有长、宽、高属性,和计算体积的方法。编写一个测试类,对以上两个类进行测试,创建一个长方体,定义其长、宽、高,输出其底面积和体积。
【简答题】What does the writer ask his mother to forgive?
【判断题】Bob deposits $100 in a bank account that pays an annual interest rate of 5 percent. A year later, Bob withdraws his $105. If inflation was 2 percent during the year the money was deposited, then Bob’s...
A.
正确
B.
错误
【单选题】What does his mother look like? [ ]
A.
She's a doctor
B.
She is forty
C.
She is thin
D.
She works in a bank.
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