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【单选题】
若函数f(x，y)在闭区域D上连续，下列关于极值点的陈述中正确的是( )。
A.
f(x,y)的极值点一定是f（x，y）的驻点
B.
C.
如果po是可微函数f（x，y）的极值点，则在po点处df=0
D.
f（x，y）的最大值点一定是f（x，y）的极大值点
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参考答案：
举一反三
【判断题】在 内处处有定义,则 在 内一定有界
A.
正确
B.
错误
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【单选题】When the students will come back school _____ not sure so far.
A.
be
B.
is
C.
are
D.
being
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【单选题】The students of Grade Eight ________reading 9 exciting mystery stories so far.
A.
finished
B.
have finished
C.
finish
D.
will finish
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【简答题】... I believe I have so far assisted the students of our language, that this kind of phraseology will be no longer insuperable ; and the combinations of verbs and particles, by chance omitted, will be...
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【判断题】若初等函数 在 处及其邻域内有定义,则 一定存在。( )
A.
正确
B.
错误
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【单选题】设 在 内有定义, ,则( )
A.
必是 的第一类间断点
B.
必是 的第二类间断点
C.
必是 的连续点
D.
在 处的连续性与 的取值有关
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【简答题】Perhaps this was the price ____________ (为进步而付出的)in the first place.
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【多选题】So far, how many students have ( ) the English contest to be held next month?
A.
participated in
B.
taken part in
C.
entered for
D.
gone
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【单选题】Perhaps my proudest achievement ______ has been setting up the first shift workers' day nursery in the UK, providing care for the children of health service staff.
A.
to light
B.
to date
C.
to heart
D.
to advantage
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【单选题】So far,the students ______ asked to work hard at least 5 times.
A.
are
B.
were
C.
have
D.
have been
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相关题目：
【判断题】在 内处处有定义,则 在 内一定有界
A.
正确
B.
错误
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【单选题】When the students will come back school _____ not sure so far.
A.
be
B.
is
C.
are
D.
being
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【单选题】The students of Grade Eight ________reading 9 exciting mystery stories so far.
A.
finished
B.
have finished
C.
finish
D.
will finish
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【简答题】... I believe I have so far assisted the students of our language, that this kind of phraseology will be no longer insuperable ; and the combinations of verbs and particles, by chance omitted, will be...
查看完整题目与答案
【判断题】若初等函数 在 处及其邻域内有定义,则 一定存在。( )
A.
正确
B.
错误
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【单选题】设 在 内有定义, ,则( )
A.
必是 的第一类间断点
B.
必是 的第二类间断点
C.
必是 的连续点
D.
在 处的连续性与 的取值有关
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【简答题】Perhaps this was the price ____________ (为进步而付出的)in the first place.
查看完整题目与答案
【多选题】So far, how many students have ( ) the English contest to be held next month?
A.
participated in
B.
taken part in
C.
entered for
D.
gone
查看完整题目与答案
【单选题】Perhaps my proudest achievement ______ has been setting up the first shift workers' day nursery in the UK, providing care for the children of health service staff.
A.
to light
B.
to date
C.
to heart
D.
to advantage
查看完整题目与答案
【单选题】So far,the students ______ asked to work hard at least 5 times.
A.
are
B.
were
C.
have
D.
have been
查看完整题目与答案
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