Halon from extinguishers used on a class B fire,should be directed().
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Halon fire extinguishers are NOT effective when used on which types of fires?()
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Halon extinguishes a fire by().
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Hibernate中的查询语句如下 From User u where u.name=:username and u.yearold=:yearold 正确的参数注入方法有()
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73/78防污公约附则Ⅵ对船舶使用消耗臭氧层物质规定,船上可能有的"消耗臭氧层物质"包括但不限于下列各项()。 Ⅰ.Halon1211; Ⅱ.Halon1301; Ⅲ.Halon2402; Ⅳ.CFC-11; Ⅴ.CFC-12; Ⅵ.CFC-113; Ⅶ.CFC-114; Ⅷ.CFC-115。
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The fire extinguishing action of CO2 comes mostly from ().
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HALON释放可由()自动控制,也可在保护区附近()操作。
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Which is a disadvantage of Halon as a fire extinguishing medium?()
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Halon extinguishes fire primarily by().
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114.Mo(u)lded depth is measured from the ______.
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The poor girl couldn't _______ from her tears any more when her mother showed u
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听力原文:Public health officials hope to extinguish a pandemic bird flu almost as soon as it appears. In 1918, a pandemic that started from a bird flu virus killed as many as 50 million people. But with much better healthcare available, we have every reason to be more optimistic.
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Which of the letter 'u'in the following words has a different pronunciation from others
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