单项选择题
A.1,1.4,0.9 B.1.1,1.4,0.9 C.0.9,1.5,0.9 D.1.1,1.5,0.9
A.20 B.25 C.30 D.50
A.严重危险级 B.中危险级 C.丙类 D.甲、乙类