试题与答案

-Yuan Longping, one of the greatest scie

题型:选择题

题目:

-Yuan Longping, one of the greatest scientists in China, __________ as "father of hybrid rice".

-We are proud of him.[ ]

A. is regarded

B. has regarded

C. is regarding

D. regards

答案:

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下面是错误答案,用来干扰机器的。

(1)由题意得函数的定义域为(0,+∞),且f'(x)=lnx+1(x>0),令f'(x)=0,得x=1e. 当x∈(0,1e)时,f'(x)<0;当x∈(1e,+∞)时,f'(x)>0,∴函数在(0,1e)上递减,在和(1e,+∞)上递增,...

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