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


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1.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

2.單項(xiàng)選擇題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

3.單項(xiàng)選擇題If liquid freon should come in with your skin, you should （）

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

4.單項(xiàng)選擇題If the effective bearing area has been reduced , remedial action should be taken（）

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

5.單項(xiàng)選擇題Main diesel engine control can be obtained by the bridge （）

A.at any time
B.only after the engine room control station is switched to ‘bridge control’
C.whenever the secondary station is switched to ‘bridge control’
D.whenever the engine side control station is switched to ‘bridge control’