单项选择题

A portable foam fire extinguisher is placed in operation by（）

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

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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

单项选择题

A.by more than 5 percent
B.by less than 10 percent
C.to 95 percent
D.to less than 90 percent