Where foam extinguishing systems are provided on a ship，each machinery flat in the protected space must have a(n)（）.
- Acoaming
- Balarm
- Cdrain
- Dfire sensor
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1、As an extinguishing agent，foam（）.
As an extinguishing agent，foam（）.Aconducts electricityBshould be directed at the base of the fireCis most effective on burning gases which are flowingDextinguishes by cooling oil fires below ignition temperature
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2、Portable foam type fire extinguishers
Portable foam type fire extinguishers are most effective on（）.Amattress firesBoil firesCwood firesDAll of the above
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3、How does foam extinguish an oil fire?（
How does foam extinguish an oil fire?（）ABy cooling the oil below the ignition temperatureBBy removing the fuel source from the fireCBy excluding the oxygen from the fireDBy increasing the weight of the oil
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4、Foam-type portable fire extinguishers
Foam-type portable fire extinguishers are most useful in combating fires involving（）.Asolid materials such as wood or bales of fiberBflammable liquidsCelectrical equipmentDmetallic solid
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5、Foam extinguishes a fire by（）.
Foam extinguishes a fire by（）.Asmothering the burning materialBchemical combination with burning materialCabsorbing the burning materialDorganic destruction of the burning material
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6、Foam-type portable fire extinguishers
Foam-type portable fire extinguishers are more usefull in combating fires involving（）.Asolid materials such as wood or bales of fiberBinflammable liquidsCelectrical equipmentDmetallic solid