单项选择题
A.0.5%B.2%C.1%D.3%
A.3~70B.10~15C.15~2D.20~30
A.1:(10-12)B.1:(12-15)C.1:(28-30)D.1:(35-40)
A.1:(20~30)B.1:(12~15)C.1:(10~12)D.1:(35~40)
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