单项选择题
A.0.25%～0.4% B.0.35%～0.37% C.1% D.2%
A.8%～9%B.10%～12%C.13%～14%D.15%～16%
A.8 B.6 C.10 D.13
A.6种 B.8种 C.10种 D.13种
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