A.95% B.99.7% C.70% D.90%
A.可燃物、助燃物與著火點(diǎn) B.可燃物、助燃物與點(diǎn)火源 C.可燃物、助燃物與極限濃度 D.可燃物、氧氣與溫度
A.0.25~0.35% B.0.5% C.0.6~0.8% D.0.8%