A.燃?xì)夂俊礃O限濃度 B.燃?xì)鉂舛仍谏?、下限之間 C.燃?xì)夂俊禈O限濃度
A.5~23% B.4.5~13.1% C.5~15%
A.5~23% B.12.4~75% C.35~72%