A.縱向受力鋼筋外表面至梁近表面的距離 B.主筋外表面至梁受壓表面的距離 C.縱向受拉鋼筋合力點到截面受拉邊緣的距離 D.縱向受拉鋼筋合力點到截面受壓邊緣的距離
A.50mm,100mm,200mm B.50mm,100mm,150mm C.10mm,50mm,100mm D.10mm,20mm,50mm
A.50mm,100mm B.10mm,50mm C.10mm,100mm D.10mm,20mm