单项选择题
A.0.3-0.4B.0.4-0.5C.0.1-0.2D.0.2-0.3
A.50B.100C.300D.200
A.N、KB.P、BC.K、PD.N、P
A.1:2:3B.1:2:1C.1:0.5:1.2D.1:1:1
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