单项选择题
A.60 B.72 C.54 D.42
A.70％ B.65％ C.55％ D.50％
A.0.98～0.99 B.0.97 C.0.96 D.0.94～0.96
A.0.4～0.7 B.0.5～0.7 C.0.6～0.8 D.0.6-0.9
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