A.Foam conducts electricity
B.To be most effective，foam should be directed at the base of the fire
C.Foam is most effective on burning liquids which are flowing
D.Foam can ONLY be used to extinguish class A fires
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A.Give them brandy
B.Keep them in motion
C.Immerse them in a warm bath (105°F，40°C)
D.Cover them with an electric blanket set for maximum temperature
A.Foam should not be used on electrical fires
B.One kilo of low expansion foam solution produces much more foam
C.Foam is only efficient when it covers the top of burning combustibles
D.A stream of foam should be deflected off the deck in order to best agitate the fire
A.Stranding or grounding
B.Striking upon rocks or shoals
C.Collision between ships
D.Fire
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
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
最新試題
The ship which strikes any other vessel is called the（）.
All the traces are（）old ones.
A VESSEL，OTHER THAN A RESCUE UNIT，DESIGNATED TO CO-ORDINATE SURFACE SEARCH AND RESCUE OPERATION WITHIN A SPECIFIED AREA is known as（）.
If your radiotelephone fails while underway，（）.
Please（）search and rescue.
Downwind for 1 miles，alter to starboard 90 degrees，go down this course for 1 mile；Then alter 90 degrees to starboard and go down this course for 2 miles；Then alter 90 degrees to starboard and go down this course for 2 miles；Keep adding 1 mile ever time you alter to starboard．This operation is（）search pattern
The key to rescuing a man overboard is（）.
If you are on the beach and are signaling to a small boat in distress that your present location is dangerous and they should land to the left，you would（）.
When carrying out a parallel track search pattern，the course of the search units should normally be which of the following（）.
Which statement about firefighting foam is TRUE?（）