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【单选题】
Which of the following statements is true about the 24 Solar terms?A.
The 24 Solar Terms is based on the lunar calender.
B.
The 24 Solar Terms originated from the middle and lower reaches of the Yangtze River.
C.
The 24 Solar Terms finally came into being as early as in the Zhou dyanasty.
D.
The 24 Solar Terms has acted as a guidance in Chinese farming and is still in practice.
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【简答题】证明：若函数f(x)在[x 0 -δ，x 0 ]上连续，在(x 0 -δ，x 0 )内可导，且 (A为常．数)，则f(x)在x 0 处的左导数存在且等于A
【单选题】函数f(x)在x=x0处连续，x0为f(x)的极值点，则必有()。
A.
f’(x0)=0
B.
f’(x0)不等于0
C.
f’(x0)不存在
D.
f’(x0)=0或不存在
【简答题】已知函数f(x)在x=x 0 处连续，且 (A为常数)，问f'(x 0 )是否存在？