单项选择题
A.≤1:1.5 B.≥1:1.5 C.≤1:1 D.≥1:1
A.1:12B.1:10C.1:8D.1:6
A.0.2~0.3 B.0.1~0.15 C.0.15~0.25 D.0.25~0.35
A.0.1 B.0.2 C.0.3 D.0.4
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