單項選擇題Which of the following statements is true concerning Halon 1301 fire extinguishing equipment?（）

A.The agent is considered nontoxic at room temperature in low concentrations
B.The agent is less effective than carbon dioxide
C.Halon primarily extinguishes the fire by cooling
D.The agent cannot be used on electrical fires because it leaves a residue


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1.單項選擇題In order to find out which lifeboat you are assigned, you should look at the （）.

A.Certificate of Inspection
B.Station Bill
C.Ships Articles
D.Fire Control Plan

2.單項選擇題You may improve a vessels stability by （）.

A.keeping the fuel tanks topped off
B.increasing the free surface effect
C.keeping the fuel tanks at least half MI
D.keeping at least one fuel tank empty for slops

3.單項選擇題When reentering an engine room that has been flooded with CO2, the investigating team should initially（）.

A.leave the access door partially open
B.enter from the lowest level
C.enter from the highest level
D.attempt to operate machinery

4.單項選擇題If there has been a fire in a closed unventilated compartment it may be unsafe to enter because of （）.

A.unburned carbon particles
B.excess nitrogen
C.a lack of oxygen
D.excess hydrogen

5.單項選擇題After a fire has been extinguished in a closed space, personnel may safely enter the space when （）.

A.smoke density has been decreased sufficiently to see the bulkhead opposite the compartments entrance
B.a lifeline and explosion proof flash light are used
C.all smoke and toxic fumes are removed and an adequate oxygen supply is present
D.overhaul has been completed to remove any possible source of re-ignition