【单选题】
闪燃往往是着火的先兆,能使可燃液体发生闪燃的___称为该液体的闪点。
A. 最高温度
B. 最高熔点
C. 最低熔点
D. 最低温度
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答案
D
解析
暂无解析
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可燃物质在有足够助燃物质(如充足的空气、氧气)的情况下,因着火源作用引起的___现象,称为着火。
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使可燃物质发生___称为该液体的着火点(燃点)。物质的燃点越低,越容易着火。
A. 瞬间燃烧的最低温度
B. 持续燃烧的最低温度
C. 持续燃烧的最高温度
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【单选题】
对易燃液体来说,一般燃点约高于闪点___℃。
A. 1~5
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【单选题】
在一定条件下,可燃物质产生自燃的___为自燃点,也称引燃温度,自燃点是衡量可燃物质火灾危险性的又一个重要参数。
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可燃物质在外界热源作用下,温度逐渐升高,当达到___时,即可着火燃烧,称为受热自燃。
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爆炸是一种极为迅速的物理或化学的能量___过程。
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化学爆炸是由物质的化学变化造成的,其特征是爆炸前后物质的化学组成及化学物质___变化。
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___比较普遍,化工企业中发生的爆炸多属于此类。
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如果可燃气体或液体蒸气与空气的混合是___进行的,则发生稳定燃烧(扩散燃烧),如火炬燃烧、气焊燃烧、燃气加热等。
A. 在燃烧过程中
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【单选题】
如果可燃气体或液体蒸气与空气___按一定比例混合,遇火源则发生爆炸。
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在燃烧之前即气体扩散阶段形成的一个足够大的云团,如在一个作业区域内发生泄露,经过一段延迟时期后再点燃,则会产生___爆炸,形成大范围的破坏。
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【单选题】
可燃物在爆炸上限和爆炸下限之间都能发生爆炸,这个浓度范围称为该物质的___。
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【单选题】
可燃性混合物的___范围越宽,其爆炸的危险性越大。
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浓度在爆炸下限以下或爆炸上限以上的混合物是___着火或爆炸的。
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爆炸极限通常用可燃气体或可燃蒸气在空气混合物中的___
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爆炸极限___,火灾危险性越大。
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着火能量越小,火灾危险性越大可燃气体的着火能量都比较小,但是不同品种的可燃气体的最小着火能量可相差___倍。
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氢的最小着火能量为0.019mJ,甲烷为0.28mJ,所以氢气的火灾危险性比甲烷___。
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___越活泼,火灾危险性越大。
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可燃气体的密度越轻,越容易迅速___,火灾危险性相对小些。
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闪点低,表示在___,因此该液体容易着火燃烧
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可燃液体与易燃液体是以闪点作为划分标准的,闪点<___的可燃液体称为易燃液体。
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可燃液体与易燃液体是以闪点作为划分标准,闪点≥60℃的液体为___。
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二硫化碳(S2)的最小着火能量仅为0.0019mJ,因此虽然二硫化碳的密度大(比水重),但仍极危险。一般加水使___,以减少危险性。
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TNT的爆炸温度为300℃,而雷汞仅为l65℃,___,所以危险性较前者大。
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《公安消防部队执勤条令(试行)》规定,交接班时听到出动信号,由___负责出动。
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机械设备、装置、容器等爆炸后产生许多碎片,飞出后会在相当大的范围内造成危害。一般碎片在___米内飞散。
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爆炸发生后,爆炸气体产物的扩散只发生在极其短促的瞬间内,对一般可燃物来说,不足以造成起火燃烧,而且冲击波造成的爆炸风还有___作用。
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许多物质___,发生爆炸事故时,会使大量有害物质外泄,造成人员中毒和环境污染。
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任何化学品都是有毒的,所不同的是引起___。
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把较小剂量就能引起生物体损害的那些化学物质叫做___,其余为非毒物。
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职业病危害因素指对___的各种危害。
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个体防护用品既不能降低作业场所中有害化学品的浓度,也不能消除作业场所的有害化学品,而只是一道___的屏障。
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危险化学品生产企业发现其生产的危险化学品有___的,应当立即公告,并及时修订其化学品安全技术说明书和化学品安全标签。
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生产第二类、第三类易制毒化学品的,应当自生产之日起___日内,将生产的品种、数量等情况,向所在地的设区的市级人民政府安全生产监督管理部门备案。
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【单选题】
国家对危险化学品经营销售实行___。
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易燃液体、遇湿易燃物品、易燃固体不得与___混合贮存,具有还原性氧化剂应单独存放。
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