A.撤離路線(xiàn) B.來(lái)源 C.泄漏點(diǎn) D.風(fēng)向
A.硫化亞鐵 B.硫化氫 C.氫 D.氫硫酸
A.15mg/m3(10ppm) B.30mg/m3(20ppm) C.150mg/m3(100ppm) D.75mg/m3(50ppm)