单项选择题
A.1:3 B.1:2~1:2.5 C.1:1.5 D.1:3~1:4
A.100m2 B.64m2 C.36m2 D.25m2
A.1:2 B.1:3 C.1:6 D.1:8
A.<3% B.3%~10% C.10%~15% D.>15%
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