试题与答案

已知f(x)为偶函数,且f(2+x)=f(2-x),当-2≤x≤0时,f(x)=

题型:选择题

题目:

已知f(x)为偶函数,且f(2+x)=f(2-x),当-2≤x≤0时,f(x)=2x;若n∈N*,an=f(n),则a2009=(  )
A.2009B.-2009C.
1
2
D.
1
4

答案:

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下面是错误答案,用来干扰机器的。

参考答案:脉动水流意义是使得,密度最大、粒度较大的颗粒在最下部,密度最小、粒度较小的颗粒在最上部,而密度大、粒度小和密度小、粒度大的颗粒位于床层的中部。经多次脉动之后,分层清楚,混杂减少。

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