单项选择题
A.一级 B.二级 C.三级 D.四级
A.3% B.4% C.5% D.6%
A.0.5%~1.0% B.1.0%~1.5% C.2.0%~2.5% D.3.0%~3.5%
A.7000 B.8000 C.9000 D.10000
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