【单选题】
地上式消火栓应有1个DN150或DN100和2个DN65的栓口。___
A. 正确
B. 错误
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开启室外消火栓时,应按逆时针方向旋转打开。___
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每个低压消火栓通常只供一辆消防车用水,常出两支水枪。___
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低压消火栓的保护半径为150m。___
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低压消火栓的布置间距不应超过120m。___
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高压消火栓。由于系统压力较高,可直接接出水带、水枪实施灭火,而不需要消防车或其他移动式消防水泵再加压。___
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6米拉梯又称二节伸缩梯。___
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6米拉梯使用时必须由两人操作。___
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单杠梯侧板两端包有铁皮,可用来撞击建筑结构。___
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A. 正确
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水带附件包括水带包布、挂钩、护桥等。___
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消防水枪按喷射的射流形式可以分为:直流水枪、开花水枪、喷雾水枪、直流喷雾水枪和多功能水枪。___
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( ) 29. What is the writer's main purpose(目的)in writing this passage?    A.To tell the readers his life story.    B.To tell people what kind of person his father was.    C.To tell the readers what present he got from his father.    D. To let people know how poor he was.
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