单项选择题
A.30B.35C.40D.45
A.一倍B.两倍C.三倍D.四倍
A.22-110B.50-220C.70-180D.90-130
A.0.2-0.3%B.0.3-0.4%C.0.4-0.8%D.0.8-0.9%
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