单项选择题
A.86%B.60%C.78%D.70%
A.82%B.90%C.74%D.66%
A.80%B.90%C.64%D.72%
A.总出粉率十8%B.总出粉率-8%C.总出粉率十18%D.总出粉率-18%
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