As an extinguishing agent，foam（）.

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• An emergence sea anchor may be constructed by type of extinguisher?（）.

  A . a boat bucket B . an air tank filled with water C . an oar and canvas weighted down D . All of the above

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• To extinguish an electrical fire, you should use （）.

  A . mechanical foam B . chemical foam C . carbon dioxide D . soda acid

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• Which extinguishing agent is NOT recommended in the Chemical Data Guide for use on a cyclohexane fire?（）

  A . Foam B . Carbon dioxide C . Dry chemical D . Water fog

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• Which of the following statements is true concerning carbon dioxide when used as a fire extinguishing agent?（）

  A . Carbon dioxide is corrosive when exposed to fire B . Carbon dioxide should be applied slowly to a large engine room fire C . Its total cooling effect is far greater than water D . Its smothering effect is excellent for class B fire

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• A definite advantage of using water as a fire extinguishing agent is its characteristic of（）.

  A . alternate expansion and contraction as water in a liquid state becomes a vapor B . absorption of smoke and gases as water is converted from a liquid to a vapor C . rapid contraction as water is converted from a liquid to a vapor D . rapid expansion as water absorbs heat and changes to steam

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• On a bulk chemical carrier，water should NOT be used as an extinguishing agent to fight a fire if the water may come into contact with the chemical called（）.

  A . acrylic acid B . benzene C . oleum D . vinyl toluene

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• Water is a very effective fire extinguishing agent because it（）

  A . will remove all the toxic fumes from the air B . has the greatest cooling ability C . will leave no harmful residue D . completely removes combustible vapors from the air

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• How does foam extinguish an oil fire?（）

  A . By cooling the oil below the ignition temperature B . By removing the fuel source from the fire C . By excluding the oxygen from the fire D . By increasing the weight of the oil

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• 0ne of the limitations of foam as an extinguishing agent is that foam（）.

  A . cannot be made with salt water B . is heavierthan oil and sinks below its surface C . is corrosive and to fire fighters D . conducts electricity

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• Carbon dioxide as a fire fighting agent has which advantage over other agents? （）

  A . It causes minimal damage B . It is safer for personnel C . It is cheaper D . It is most effective on a per unit basi

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• An advantage of an ABC dry chemical over a carbon dioxide extinguisher is（）.

  A . lack of toxicity B . the multipurpose extinguishing ability C . burn-back protection D . cooling ability

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• One of the limitations of foam as an extinguishing agent is that foam（）.

  A . cannot be made with salt water B . is heavier than oil and sinks below its surface C . is corrosive and a hazard to fire fighters D . conducts electricity

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• How many skills may an agent have?（）

  A . 25  B . 50  C . no enforced limit  D . as many as the number of ports supported on the server

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• Which of the listed extinguishing agents is NOT suitable for fighting a liquid paint fire?（）

  A . Dry chemical B . Foam C . Water D . Carbon dioxide

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• （），as the chemical extinguisher agent，should be used for an electric fire.

  A . dry chemical or foam B . foam or soda acid C . carbon dioxide or foam D . carbon dioxide or dry chemical

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• Which characteristic is an advantage of Halon as a fire extinguishing medium?（）

  A . Electrically non-conductive B . Relatively inexpensive C . Effective against chemicals containing an oxidizer D . All of the above

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• An extinguishing agent which effectively cools，dilutes combustible vapors，removes oxygen，and provides a heat and smoke screen is（）.

  A . carbon dioxide B . Halon 1301 C . dry chemical D . water fog

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• Which is a disadvantage of Halon as a fire extinguishing medium?（）

  A . Conducts electricity B . Difficult to store C . Large volume necessary to be effective D . Ineffective in powdered metal fire

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• Carbon dioxide as a fire fighting agent has which advantage over other agents?（）.

  A . It causes minimal damage B . It is safe for personnel C . It is cheaper D . It is most effective on a per unit basi

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• What is NOT a characteristic of carbon dioxide fire-extinguishing agents?（）

  A . Effective even if ventilation is not shut down B . Will not deteriorate in storage C . Non-corrosive D . Effective on electrical equipment

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• For which of the listed classes of fire combinations would carbon dioxide be most suitable as the extinguishing agent （）.

  A . Class "A" and class "B" B . Class "B" and class "C" C . Class "A" and class " C" D . Class "C", class "D", and class "E&quot

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• Which extinguishing agent is recommended in the Chemical Data Guide for use on a carbon disulfide fire?（）

  A . Alcohol foam B . Dry chemical C . Chemical foam D . Water fog

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• 129．One of the limitations of foam as an extinguishing agent is that foam ______.

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• A “ customs agent ” means the same as a “ customs broker ”.（)

  是 否

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