单项选择题
A.1~2% B.5~6% C.4~5% D.7%以上
A.100~110 B.160~170 C.120~150 D.100~170
A.0.05～0.09 B.2～3 C.1～2 D.0.2～0.7
A.99.65% B.91.67% C.89.33% D.99.87%
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