单项选择题
A.1:1:1 B.1:1:2 C.1:2:1.5~2.0 D.1:3:3
A.30~60 B.60~100 C.70~110 D.80~120
A.1/2 B.1/3 C.1/4 D.1/5
A.100~200 B.150~250 C.200~300 D.250~350
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