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【多选题】
在利用分割、近似、求和、取极限的梯形的面积的时候,下列说法正确的是 _________ 。A.
梯形的曲线必须连续
B.
梯形的曲线不要求连续
C.
梯形的曲线可以有间断点
D.
梯形的曲线可以有第一类间断点
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举一反三
【单选题】Which of the following sentences is INCORRECT?(2010)
A.
All his lectures are very interesting.
B.
Half their savings were gone.
C.
Many his friends came to the party
D.
Both his sisters are nurse.
【单选题】Which of the following statements is true?
A.
Many people go to cinema to have an interesting movie as a substitute.
B.
Many people go out shopping as a way to change their habit.
C.
Many people go to the bookstore to have a good book as a substitute.
D.
Many people go out shopping without a second thought when having pressure.
【单选题】At the end of the nineteenth century, a rising interest in Native American customs and an increasing desire to understand Native American culture prompted ethnolo- gists to begin recording the life st...
A.
The historical backgrounds of two currently used research methods are chronicled.
B.
The validity of the data collected by using two different research methods is compared.
C.
The usefulness of a research method is questioned and then a new method is proposed.
D.
The use of a research method is described and the limitations of the results obtained are discussed.
E.
A research method is evaluated and the changes necessary for its adaptation to other subject areas are discussed.
【简答题】()对于发挥社会主义制度的优越性具有关键性作用。
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