单项选择题
A.成正比 B.不成比例 C.成反比 D.相等
A.350 B.400 C.450 D.500
A.0.5%～0.6% B.0.6%～0.8% C.0.85%～1.05% D.1%～2%
A.1 B.5 C.10 D.15
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