单项选择题
A.13 B.15 C.17 D.19
A.燃烧猛烈 B.燃烧与爆炸交替进行 C.严重性 D.可控性
A.0.02g/L;0.01g/L B.0.08g/L;0.10g/L C.0.05g/L;0.04g/L D.0.01g/L;0.02g/L