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【单选题】
污水处理中厌氧工艺有那些?A.
氧化沟
B.
阵减曝气
C.
A2/O
D.
折流板反应器
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【单选题】函数 在原点(0,0)间断的原因是函数()
A.
在原点无定义
B.
在原点极限存在,但在原点无定义
C.
在原点极限不存在
D.
在原点极限存在,但极限值不等于原点处的函数值
【简答题】材料： 研究植物的光合作用是否需要CO2 呈现实验方案：将两株大小相同的天竺葵放在暗处2～3天后。分别放置在2个相同规格的密闭容器中，其中一容器装氢氧化钠溶液，另一个容器中装等量水。放阳光下照射几小时后，分别取下叶片，放入盛有酒精的烧杯里，水浴加热，溶去叶绿素，滴碘酒，观察叶片颜色。 呈现实验结果：甲中的叶片未变成蓝色；乙中的叶片变成了蓝色。 问题：本实验可以得出什么结论? 生1：乙中植物进行着光...
【简答题】完形填空 Anna lived on the side of a valley. One summer, there was a very big 1 , an d a lot of houses down below Anna's were washed away. Anna's house was 2 enough to escape the flood, so when the water ...
【简答题】Anna lived on the side of a valley. One winter, there was a very big flood, and a lot of houses 36 Anna's were washed away. Anna's house was high enough to escape the flood, so when the water had disa...
【简答题】证明：函数 在原点处的两个偏导数都不存在，但函数在原点有极大值
【单选题】With real estate （房地产）______ in economy, a lot of rich farmland had to ______ new houses and offices in the area.
A.
leading the way; make way for
B.
led the way; made the way
C.
to lead the way; be made the way for
D.
leading way; be made the way for
【简答题】阅读下面材料,根据要求完成。 Anna lived on the side of a valley in Australia. Although she was poor, she was always helpful. One winter, there was a very big flood, and a lot of houses were washed away. Anna’s hous...
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