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【简答题】
试述好氧塘、兼性塘和厌氧塘净化污水的基本原理及优缺点。
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举一反三
【单选题】As your textbook explains, visual aids are most effective when they are displayed __________.
A.
throughout the speech
B.
during the introduction of a speech
C.
on an easel where they are visible to everyone
D.
only while the speaker is discussing them
【多选题】Which of the following methods are visual aids methods?
A.
transparencies
B.
pie charts
C.
movie clips
D.
maps
【单选题】有限责任公司公开发行公司债券对公司净资产的要求是（）。
A.
不低于人民币3000万元
B.
不低于人民币5000万元
C.
不低于人民币6000万元
D.
不低于人民币1亿元
【单选题】In what way do women contribute to the small family size according to the text?
A.
By educating their children.
B.
By marrying late.
C.
By supporting the small family.
D.
By educating their husbands.
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