单项选择题
A.0.5B.0.3C.0.2D.0.1
A.0.8~0.9B.0.6~0.7C.0.4~0.5D.0.2~0.35
A.0.20~0.30B.0.15~0.0.20C.0.08~0.09D.0.05~0.02
A.PV=7,YP=7B.PV=14,YP=14C.PV=16,YP=16D.PV=21,YP=21
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