单项选择题
Which fire fighting agent has the greatest capacity for absorbing heat?（）
A.water
B.dry chemical
C.foam
D.CO2
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相关考题
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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 -
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 -
单项选择题
Before you begin administering artificial respiration, you should be sure the victim（）
A.is comfortable
B.is warm
C.is not bleeding
D.has a clear airway
