单项选择题
A.60:40B.70:30C.65:35D.50:50
A.10%~20%B.5%~10%C.8%~12%D.15%~20%
A.2.5倍B.1.5倍C.2倍D.1倍
A.4~7胎B.5~8胎C.9~10胎D.2~3胎
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