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【单选题】
设 在点 的某去心邻域内连续,且满足 ,则函数 在点 处( )。A.
取极大值
B.
取极小值
C.
不取极值
D.
无法确定是否有极值
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反馈参考答案：
举一反三
【简答题】由三极管构成的基本放大电路有三种形式,即( )放大电路、( )放大电路和( )放大电路。
【单选题】In the third sentence of paragraph, the 'troubled issue' refers to______.
A.
the death of the old king
B.
Merlin' s advice
C.
the succession to the crown
D.
the quarrel among the powerful lords
【单选题】The author associates the issue of global warming with that of smoking because ______.
A.
they both suffered from the government's negligence
B.
a lesson from the latter is applicable to the former
C.
the outcome of the latter aggravates the former
D.
both of them have turned from bad to worse
【简答题】方尖碑代表( )
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