A、penetrates to the bottom of the fire
B、is kept saturated with low-velocity water fog
C、mixes with the burning fuel oil
D、completely covers the top of the burning liquid
更多“Firefighting foam is only effective when the foam（）.”相关的问题
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、a Coast Guard inspection officer B、the safety man aboard the unit C、the designated person in charge of the unit D、the manufacturer or his authorized representative
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、Slow down the spread of fire by cooling adjacent structures B、Cover the fire with foam C、Smother the fire with a blanket or similar object D、Break up solid objects to ensure that any deep seated fires are extinguished
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、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、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、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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