A.1200mm B.1500mm C.1800mm D.2400mm
A.5mB.6mC.7mD.8m
A.0.50kN/m2;0.50kN/m2 B.0.50kN/m2;0.30kN/m2 C.0.30kN/m2;0.30kN/m2 D.0.30kN/m2;0.50kN/m2