单项选择题
A.0.75B.0.5C.0.25D.0.1
A.0.5JB.0.4JC.5JD.4J
A.6HB.8HC.12HD.24H
A.P1≤1.4PNB.P1≤1.6PNC.P1≥1.4PND.P1≥1.6PN
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