单项选择题
A.17.6%B.19.6%C.21.6%D.23.6%
A.24.5%B.28.5%C.32.5%D.36.5%
A.21%B.22%C.23%D.24%
A.28.5%B.32.5%C.36.5%D.38.5%
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