单项选择题

Which types of portable extinguisher should you watch for the reflash of the fire?（）

A.foam and water
B.CO₂ and dry chemical
C.dry chemical and water
D.foam and CO₂

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单项选择题

A.turning it upside down
B.pressing the foam lever
C.squeezing the grip handle
D.opening the hose valve

单项选择题

A.is comfortable
B.is warm
C.is not bleeding
D.has a clear airway

单项选择题

A.wash with salt water
B.wash with sterile mineral oil
C.treat it like frostbite
D.treat it like any burn