单项选择题
A.1次 B.2次 C.3次 D.4次
A.60% B.80%-85% C.10%-15% D.35%-37%
A.6%-8% B.80%-85% C.10%-15% D.48%-50%
A.1:100-110 B.1:10-20 C.1:3-4 D.1:6-7
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