单项选择题
A.1倍B.1.5倍C.2.0倍D.1.5~2.0倍
A.1:2~1:3B.1:2.5~1:3.5C.1:2.5~1:4D.1:2~1:4
A.1:1.3~1:1.7B.1:1.5~1:2.0C.1:2.5~1:3D.1:2~1:4
A.33%B.34%C.35%D.36%
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