某鋼筋混凝土梁配筋圖如圖所示,保護層厚為25mm,鋼筋彎起角度均為45°。
A.6000mm B.6488mm C.6738mm D.6698mm
A.4505mm B.4650mm C.4750mm D.6000mm
A.1804mm B.1838mm C.1910mm D.1980mm
A.3d B.5d C.10d D.100mm