单项选择题
A.1/2B.2/3C.3/4
A.0.2%B.0.4%C.0.6%
A.0.6%~0.8%B.0.4%~0.6%C.0.2%~0.4%
A.0.1%~0.7%B.0.2%~0.8%C.0.3%~0.9%
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