A.20m B.30m C.50m D.100m
A.疑似井涌;危險;拆卸 B.火情;安全;滅火 C.洪水;嚴重;防護 D.溢流;危險;控制
A.0.01~0.05g/cm3 B.0.05~0.10g/cm3 C.0.10~0.15g/cm3 D.0.15~0.20g/cm3