单项选择题
A.0.333 B.0.5 C.0.667 D.0.25
A.400m2 B.500m2 C.800m2 D.1000m2
A.30%,25% B.25%,30% C.35%,25% D.30%,20%
A.15%~20% B.25%~30% C.20%~35% D.30%~40%
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