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【单选题】
若函数【图片】在开域【图片】上连续，则函数【图片】在【图片】上A.
必有最大值和最小值
B.
值域是闭区间
C.
一致连续
D.
任意两个函数值之间的实数一定属于值域
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A.
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B.
a; a; the
C.
a; a; a
D.
the; an; a
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A.
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B.
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C.
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【单选题】One morning he found a bag. There was ______ “s” on the corner of ____bag.
A.
a, a
B.
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C.
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【简答题】闭环控制系统的反馈装置是装在
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