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【简答题】
【图片】中【图片】称为积函数, 【图片】为积分区间, 【图片】为积分变量, 【图片】为积分（ ）限, 【图片】为积分上限.
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反馈参考答案：
举一反三
【单选题】—Your father helps me a lot. Please say your father. —I will . Thank you.
A.
say hello to
B.
say thanks to
C.
say sorry to
D.
say goodbye to
【单选题】—Your father helps me a lot. Please your father.—I will. Thank you.
A.
say hello to C. say sorry to
B.
say thanks to
C.
say sorry to
D.
say sorry to
【单选题】—Your father helps me a lot. Please ____ your father. —I will.
A.
say hello to
B.
say thanks to
C.
say sorry to
D.
say goodbye to
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