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,...