单项选择题
A.strand B.stranding C.stand D.standing
The air is （）(有毒的).A.humidB.dampC.toxicD.mould
单项选择题The air is （）(有毒的).
A.humid B.damp C.toxic D.mould
Close all fire doors and use the （）（干粉灭火器）.A. dry powde...
单项选择题Close all fire doors and use the （）（干粉灭火器）.
A. dry powder extinguisher B. foam extinguisher C. CO2 extinguisher D. portable extinguisher
The signals that will be used for emergency should be c...
单项选择题The signals that will be used for emergency should be clearly （）（列出）.
A. put out B. set out C. set on D. put on
