单项选择题
A.<21% B.=21% C.>21% D.无法判断
A.0.1~0.3 B.0.4~0.6 C.0.7~0.9 D.1~1.5
A.8-11% B.9-11% C.8-10% D.9-12%
A.8% B.12% C.10% D.15%
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