单项选择题
A.10 B.20 C.30 D.40
A.50% B.60% C.70% D.80%
A.按分块间隔浇筑 B.按分块依次浇筑 C.整体浇筑 D.按分块间隔浇筑或按分块依次浇筑
A.1:2,1:2 B.1:3,1:3 C.1:4,1:4 D.1:5,1:5
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