[单选题]

比较两组测定结果的精密度。甲组:0.38%,0.38%,0.39%,0.40%,0.40%;乙组:0.37%,0.39%,0.39%,0.40%,0.41%。则(  )。

A.乙组比甲组高

B.需要准确度数据才能判断

C.甲组比乙组高

D.甲、乙两组相同

E.无法判断

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