单项选择题
A.0.2 B.0.4 C.0.6 D.0.8
A.0.4 B.0.5 C.0.6 D.0.7
A.75～80% B.80～85% C.85～90% D.90～95%
A.46.8% B.56.8% C.66.8% D.76.8%
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