单项选择题
A.0.2㎡ B.0.3㎡ C.0.4㎡ D.0.5㎡
A.2% B.3% C.4% D.5%
A.1/2 B.1/3 C.1/4 D.1/5
A.20%~30% B.25%~30% C.30%~40% D.35%~40%
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