单项选择题
A.10%~20% B.20%~40% C.40%~60% D.10%~60%
A.10% B.15% C.20% D.25%
A.平屋顶 B.曲面屋顶 C.坡屋顶 D.其他形式的屋顶
A.2%~3% B.3%~5% C.5%~7% D.8%~l0%
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