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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