A.<300mm B.≤300mm C.≥300mm D.>300mm
A.補(bǔ)償膨脹砼 B.微收縮 C.補(bǔ)償收縮砼或者微膨脹 D.補(bǔ)償膨脹砼或者微收縮
A.Crs B.Cis C.Ces D.Cos