单项选择题
A.1/250B.1/300C.1/375D.1/450
A.0.6P3B.1.5P1C.2.0P1D.2.5P1
A.1.5P1B.2.0P1C.2.5P1D.3.0P1
A.最大值B.平均值C.最小值D.其中任意一值
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