下列命题正确的是（）
- A.函数f(x)的导数不存在的点，一定不是f(x)的极值点
- B.若x0为函数f(x)的驻点，则x0必为f(x)的极值点
- C.若函数f(x)在点x0处有极值，且f'(x0)存在，则必有f'(x0)＝0
- D.若函数f(x)在点x0处连续，则f'(x0)一定存在
正确答案及解析
正确答案
解析
根据函数在点x0处取极值的必要条件的定理，可知选项C是正确的．
你可能感兴趣的试题
Alice:Hi,Sam!It's nice to see you here.
Sam:Hi,Alice!
Alice:（56）
Sam:To my dorm.
Alice:Great!Could you take this book to Peter?
Sam:（57）Does Peter know what it is for?
Alice:Yes.（58）
Sam:（59）Are you well prepared for it?
Alice:（60）See you tomorrow!
Sam:See you!
A.How about your presentation?
B.He needs it for tomorrow's presentation.
C．l think so.
D．Where are you heading?
E．You are welcome.
F．No problem!
G．What can I do for you?
H．No，thanks!
第（60）题选
-
- A.How about your presentation?
- B.He needs it for tomorrow's presentation
- C.l think so
- D.Where are you heading?
- E.You are welcome
- F.No problem!
- G.What can I do for you?
- H.No，thanks!
- 查看答案
Alice:Hi,Sam!It's nice to see you here.
Sam:Hi,Alice!
Alice:（56）
Sam:To my dorm.
Alice:Great!Could you take this book to Peter?
Sam:（57）Does Peter know what it is for?
Alice:Yes.（58）
Sam:（59）Are you well prepared for it?
Alice:（60）See you tomorrow!
Sam:See you!
A.How about your presentation?
B.He needs it for tomorrow's presentation.
C．l think so.
D．Where are you heading?
E．You are welcome.
F．No problem!
G．What can I do for you?
H．No，thanks!
第（59）题选
-
- A.How about your presentation?
- B.He needs it for tomorrow's presentation
- C.l think so
- D.Where are you heading?
- E.You are welcome
- F.No problem!
- G.What can I do for you?
- H.No，thanks!
- 查看答案
Alice:Hi,Sam!It's nice to see you here.
Sam:Hi,Alice!
Alice:（56）
Sam:To my dorm.
Alice:Great!Could you take this book to Peter?
Sam:（57）Does Peter know what it is for?
Alice:Yes.（58）
Sam:（59）Are you well prepared for it?
Alice:（60）See you tomorrow!
Sam:See you!
A.How about your presentation?
B.He needs it for tomorrow's presentation.
C．l think so.
D．Where are you heading?
E．You are welcome.
F．No problem!
G．What can I do for you?
H．No，thanks!
第（58）题选
-
- A.How about your presentation?
- B.He needs it for tomorrow's presentation
- C.l think so
- D.Where are you heading?
- E.You are welcome
- F.No problem!
- G.What can I do for you?
- H.No，thanks!
- 查看答案
Alice:Hi,Sam!It's nice to see you here.
Sam:Hi,Alice!
Alice:（56）
Sam:To my dorm.
Alice:Great!Could you take this book to Peter?
Sam:（57）Does Peter know what it is for?
Alice:Yes.（58）
Sam:（59）Are you well prepared for it?
Alice:（60）See you tomorrow!
Sam:See you!
A.How about your presentation?
B.He needs it for tomorrow's presentation.
C．l think so.
D．Where are you heading?
E．You are welcome.
F．No problem!
G．What can I do for you?
H．No，thanks!
第（57）题选
-
- A.How about your presentation?
- B.He needs it for tomorrow's presentation
- C.l think so
- D.Where are you heading?
- E.You are welcome
- F.No problem!
- G.What can I do for you?
- H.No，thanks!
- 查看答案
Alice:Hi,Sam!It's nice to see you here.
Sam:Hi,Alice!
Alice:（56）
Sam:To my dorm.
Alice:Great!Could you take this book to Peter?
Sam:（57）Does Peter know what it is for?
Alice:Yes.（58）
Sam:（59）Are you well prepared for it?
Alice:（60）See you tomorrow!
Sam:See you!
A.How about your presentation?
B.He needs it for tomorrow's presentation.
C．l think so.
D．Where are you heading?
E．You are welcome.
F．No problem!
G．What can I do for you?
H．No，thanks!
第（56）题选
-
- A.How about your presentation?
- B.He needs it for tomorrow's presentation
- C.l think so
- D.Where are you heading?
- E.You are welcome
- F.No problem!
- G.What can I do for you?
- H.No，thanks!
- 查看答案