单项选择题
A.1 B.2 C.2.5 D.3
A.6 B.8 C.10 D.12
A.1:0.3~1:1 B.1:0.5~1:1 C.1:0.5~1:1.5 D.1:0.75~1:1.5
A.10 B.12 C.15 D.20
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