單項(xiàng)選擇題Which fire fighting agent has the greatest capacity for absorbing heat?（）
A.water
B.dry chemical
C.foam
D.CO2
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1.單項(xiàng)選擇題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
2.單項(xiàng)選擇題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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