A、it provides cooling as a secondary effect
B、works well on extinguishing electrical fires
C、can be used to combat combustible metal fires
D、All of the above
更多“Foam is a very effective smothering agent and（）.”相关的问题
A、It is MOST effective on very hot oil fires where the temperatures of the liquid exceed 100°C (212°F) B、Most foams can be used with dry chemicals to attack a fire by two methods C、Foam is effective on combustible metal fires D、Foam can be made with seawater or fresh water
A、secure the electric supply B、ventilate area to remove smoke C、start the fire pump and lead out hose D、apply foam
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
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、It is effective in controlling fire in flowing oil such as coming from a broken fuel line B、It absorbs heat from materials that could cause reignition C、Most foams can be used jointly with dry chemical extinguishing agents to attack a fire by two methods of extinguishment D、Once the surface is blanketed with foam and the fire is extinguished，no further foam is required
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
A、A.She is not very well. B、B.She is years old. C、C.She is very nice. D、D.She is as tall as I am.
A、foam or soda acid B、dry chemical or foam C、carbon dioxide or dry chemical D、carbon dioxide or foam
A、foam or soda acid B、dry chemical or foam C、carbon dioxide or dry chemical D、carbon dioxide or foam
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