单项选择题

下列说法正确的是函数在闭区间上的极大值一定比极小值大;B．函数在闭区间上的最大值一定是极大值;C．对于,下列说法正确的是函数在闭区间上的极大值一定比极小值大; B．函数在闭区间上的最大值一定是极大值; C．对于 ,若 ,则无极值; D．函数在区间上一定存在最值.

A.函数在闭区间上的极大值一定比极小值大;
B.函数在闭区间上的最大值一定是极大值;
C.对于 ,若 ,则无极值;
D.函数在区间上一定存在最值．

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单项选择题

Wht will be brriers for the development of online bill py Online bill is not sfe enoWht wi

ll be brriers for the development of online bill py Online bill is not sfe enough. B．The technology is not mture. C．Online-bill-py services chrge fee. D．Most compniesre not willing toccept it.A．Online bill is not safe enough．B．The technology is not matureC．Online-bill-pay services charge feeD．Most companies are not willing to accept it．

The guest wants to pay his bill by credit card.（）

答案：正确