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In the investigation of the cause of the bus burning accident in Chengdu, many evidences show that someone got on the bus with gasoline. (1) When a certain amount of steam is suspended in the air.
(1) A small spark is enough to make gasoline burn, which shows that the ignition point of gasoline is low. Gasoline combustion will produce carbon dioxide and water, so fill in: low;

(2) Sand can isolate combustible substances from oxygen, so as to achieve the purpose of fire fighting, so fill in: isolate air or oxygen;

(3) It is forbidden to carry inflammable and explosive articles on the bus, because firecrackers and alcohol are inflammable and explosive articles. Therefore, fill in: ad;

(4) The bus should be equipped with fire-fighting equipment that meets safety measures. B Bus seats are made of flame retardant materials, which is a safety measure. C it is a safety problem to train drivers and passengers on fire safety knowledge, and all three methods are reasonable. Therefore, fill in ABC. ..

So the answer is: (1) low; (2) Isolated from air or oxygen; (3)AD； (4)ABC。

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