单项选择题
A.0.8%～1.3% B.1.5%～2% C.0.5%～1% D.2%～2.5%
A.60%～75% B.50%～70% C.30%～50% D.15%～20%
A.4360.54 B.4250.40 C.4465.02 D.4260.30
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