Which of the following statements is the most accurate?

A.Relative PPP is not a reasonable approximation to the

B.Relative PPP is sometimes a reasonable approximation to the data but usually performs

C.Relative PPP is sometimes a reasonable approximation to the data. D. PPP is sometimes a reasonable approximation to the

D.PPP is sometimes a reasonable approximation to the data but usually performs poorly.

Answer: B

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To beleve , each day the sun wll not lve up to ther own smle.
要坚信,每一天的阳光都不会辜负自己的笑容
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