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【单选题】
设函数z=f(x,y)具有连续偏导数,在 处有 , 则( )A.
点 为函数的极大值点
B.
点 为函数的极小值点
C.
点 不是函数的极值点
D.
条件不够，无法判断
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反馈参考答案：
举一反三
【单选题】The couple had no sooner got to the station _____ the coach left. (2009)
A.
when
B.
as
C.
until
D.
than
【单选题】Important his discovery was, it was regarded as a matter of no account in his time.
A.
when
B.
until
C.
as
D.
although
【单选题】目前WHO/ISH提出的高血压诊断标准为
A.
≥120/80mmHg
B.
≥130/85mmHg
C.
≥140/90mmHg
D.
≥150/90mmHg
E.
≥160/95mmHg
【单选题】Although the examination he had passed was not important, his success______him in his ambition to become a doctor.
A.
urged
B.
encouraged
C.
promised
D.
persuaded
【简答题】A．His standpoint in important issues. B．His effort to get equal rights for women. C．His ability to create job opportunities. D．His performance at work.
【单选题】As a teacher ,it is important to get his meaning to his students.
A.
through
B.
up
C.
across
D.
over
【简答题】A．His standpoint in important issues. B．His effort to get equal rights for women. C．His ability to create job opportunities. D．His performance at work.
【简答题】函数 在 内满足拉格朗日中值定理的点是 ____。
相关题目：
【单选题】目前WHO/ISH提出的高血压诊断标准为
A.
≥120/80mmHg
B.
≥130/85mmHg
C.
≥140/90mmHg
D.
≥150/90mmHg
E.
≥160/95mmHg
参考解析：
知识点：
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