单项选择题
A.10-12 B.13-16 C.17-20 D.21-23
A.8-10 B.11-13 C.14-15 D.16-18
A.0.01-0.02 B.0.03-0.04 C.0.05-0.06 D.0.07-0.08
A.1% B.2% C.3% D.4%
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