單項(xiàng)選擇題

Which is the proper method of determining whether a portable CO₂ fire extinguisher needs recharging?（）

A.Check the tag to see when the extinguisher was last charged
B.Release a small amount of CO₂; if the CO₂ discharges，the extinguisher is acceptable
C.Weigh the extinguisher and compare the weight against that stamped on the valve
D.Recharge the extinguisher at least once each year

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單項(xiàng)選擇題

Which condition is necessary for a substance to burn?（）

A.The temperature of the substance must be equal to or above its fire point
B.The air must contain oxygen in sufficient quantity
C.The mixture of vapors with air must be within the explosive range
D.All of the above

單項(xiàng)選擇題

When retrieving the survival craft，the winch operator should stop the winch and check（）.

A.that all personnel are seated in the craft
B.that the cable has not jumped any grooves on the drum
C.which way the wind is blowing
D.the hydraulic fluid level before lifting

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Which is the proper method of determining whether a portable CO2 fire extinguisher needs recharging?（）

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Which condition is necessary for a substance to burn?（）

When retrieving the survival craft，the winch operator should stop the winch and check（）.

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Which is the proper method of determining whether a portable CO₂ fire extinguisher needs recharging?（）

When retrieving the survival craft，the winch operator should stop the winch and check（）.