A.20s,2 B.30s,2 C.20s,3 D.30s,3
A.0.5 B.0.7 C.1 D.1.2
A.30 B.60 C.90 D.120
A.以碳酸氢钠为基料的钠盐干粉灭火剂B.以硫酸钾为基料的钾盐干粉灭火剂C.以磷酸盐为基料的干粉灭火剂D.以氯化钠为基料的干粉灭火剂
A.20s.2 B.30s,2 C.20s,3 D.30s,3