单项选择题
扩展基础钢筋的最小保护层厚度,在有垫层和无垫层时分别是()。
A.25mm,50mm
B.35mm,60mm
C.40mm,70mm
D.45mm,75mm
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单项选择题
A.25mm,50mm
B.35mm,60mm
C.40mm,70mm
D.45mm,75mm
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