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
A.1%~2.0% B.1%~1.5% C.2%~3% D.3%~5%
A.12h B.24h C.36h D.48h