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【简答题】
设函数 ，其中 是 的导函数. ， (1)求 的表达式； (2)若 恒成立，求实数 的取值范围； (3)设 ，比较 与 的大小，并加以证明.
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举一反三
【简答题】不定期船运输概念
【单选题】_____ keep the insects out, she shut the window. [ ]
A.
So as to
B.
In order that
C.
In order to
D.
For
【单选题】In the streets,____________ was a hard job for the traffic police to keep the traffic in order. [ ]
A.
this
B.
it
C.
that
D.
there
【单选题】In order to keep the line moving, customers with lengthy ________ are required to do their banking inside.
A.
transit
B.
transactions
C.
turnover
D.
tempos
【单选题】How do librarians keep books in order?
A.
They arrange the books in alphabetical order.
B.
They put the books into a card catalogue.
C.
They give a number to each book.
D.
They put the books on the shelves.
【简答题】Users need to wipe ______ from the LED in order to keep it working well.
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