【单选题】
燃烧是一种放热发光的___。
A. 化学反应
B. 物理反应
C. 光电反应
D. 分解反应
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答案
A
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凡是能与空气中的氧或其他氧化剂起化学反应的物质,不论是气体、液体还是固体,也不论是金属还是非金属、无机物或是有机物,均称为___。
A. 着火源
B. 可燃物
C. 助燃物
D. 易燃物
【单选题】
___是指易燃或可燃液体表面产生闪燃的最低温度。
A. 燃点
B. 爆点
C. 临界点
D. 闪点
【单选题】
可燃物质在空气中没有外部火花、火焰等火源的作用,靠自身发热或外来热源引发的自行燃烧现象叫___。
A. 自燃
B. 着火
C. 闪燃
D. 爆燃
【单选题】
受热升华,产生可燃蒸气的是___。
A. 樟脑
B. 石蜡
C. 磷
D. 硫磺
【单选题】
___的燃烧不属于表面燃烧。
A. 木炭D
B. 钨
C. 电焊
D. 合成橡胶
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燃烧产物对灭火有利方面___。
A. 引起人员中毒、窒息
B. 在一定条件下有阻燃作用
C. 影响视线
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人们正常呼吸的空气中氧气占___左右(体积分数)。
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C. 21%
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高温能损伤呼吸道,当火场温度达到___时,能使人的血压迅速下降,导致循环系统衰竭。
A. 49~50℃
B. 59~60℃
C. 39~40℃
D. 69-70℃
【单选题】
不属于“A类火灾”的是___。
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爆炸是物质从一种状态通过___变化突然变成另一种状态,并放出巨大能量而作机械功的过程。
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礼花弹以易燃物和氧化剂为原料混合配制,能引起爆炸,燃烧时间较长,温度高,发射高度一般要求达到___。
A. 100 m以下
B. 100-200m
C. 200~500m
D. 500m以上
【单选题】
影响爆炸品敏感度的因素很多,决定性的内在因素是___。
A. 化学组成和化学结构
B. 高温
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【单选题】
易燃气体是指20℃和101.3kPa条件下,与空气的混合物按体积分数占___或更少时可点燃。
A. 15%
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C. 13%
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乙炔无色无臭气体,大部分工业品含有硫化物、磷化物等杂质,使其有蒜样气味,极易燃烧爆炸,爆炸极限___。
A. 15%~85%
B. 0.5%~92%
C. 1.5%~12%
D. 2.5%~82%
【单选题】
固体可燃物燃烧而引起的火灾是___。
A. A类火灾
B. B类火灾
C. C类火灾
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氯气___色有刺激性气味的气体。
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C. 蓝色
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【单选题】
煤气无色有特臭的易燃气体,剧毒,爆炸极限___。
A. 1.5%~10%
B. 2.5%~20%
C. 4.5%~40%
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多功能消防水枪主要适用于___。
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A. 2.5
B. 2
C. 1.6
D. 1.2
【单选题】
喷嘴喷射超高压微细水雾的初速度≥200m/s,喷射距离≥___。
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【单选题】
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A. 20
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C. 30
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【单选题】
高倍数泡沫的发泡倍数不低于___倍。
A. 100
B. 150
C. 200
D. 50
【单选题】
容积为6升,最高工作压力为30MPa的正压式空气呼吸器理论上最大使用时间是___分钟。
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消防员可穿着___进入火焰区进行灭火救援。
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___用于产生大流量、远射程、高强度射流,以扑救大规模、大面积火灾。
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易燃性建筑材料,是在火灾发生时,发生___。
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B. 难起火、难微燃、难炭化
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属于可燃性建筑材料是___
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垂直防火分区,就是将具有___耐火极限的楼板和窗间墙(两上、下窗之间的距离不小于2m)将上下层隔开。
A. 2h或2.5h
B. 1.5h或2h
C. 1h或1.5h
D. 0.5h或1h
【单选题】
按《建筑设计防火规范》,耐火等级一、二级体育馆、剧院的观众厅,展览建筑的展厅,其防火分区最大允许建筑面积可适当放宽___㎡。
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The video cameras were used to catch the dogs' responses because ___________.
A. the dogs were put in the wooden boxes  and tested one at a time
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D.  to help people judge the mood of dogs
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【单选题】
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D. feed homeless animals in car parks
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A. the owners can leave their dogs in hot cars
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C. the new law can prevent cruelty to animals
D. the new law gives recognition to the  people who feed homeless cat
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If a person finds getting up early a problem, most probably ________.___
A. he is a lazy person
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C. he is not sure when his energy is low
D. he is at his peak in the afternoon or evening
【单选题】
Which of the following may lead to family quarrels according to the passage?___
A. Unawareness of energy cycles.
B. Familiar monologues.
C. A change in a family member's energy cycle.
D. Attempts to control the energy cycle of other family members.
【单选题】
If one wants to work efficiently at his low point in the morning, he should __________.___
A. change his energy cycle
B. overcome his laziness
C. get up earlier than usual
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【单选题】
You are advised to rise with a yawn and stretch because it will __________.___
A. help to keep your energy for the day's work
B. help you to control your temper early in the day
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【单选题】
Which of the following statements is NOT true?___
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【单选题】
An effective way to prevent the burnout of young athletes is __________.___
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A. it can help them learn more about society
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【单选题】
Many coaches and parents are in the habit of criticizing young athletes __________.___
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【单选题】
According to the passage parents and coaches should __________.___
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The author's purpose in writing the passage is _________.___
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As pointed out at the beginning of the passage, people used to think that air pollution _______.___
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【单选题】
As to the greenhouse effect, the author ________.___
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The underlined word "offset" in the second paragraph could be replaced by _________.___
A. slip into                 
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【单选题】
It can be concluded that ____________.___
A. raising the world's temperature only a few degrees would not do much harm to life on earth
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【单选题】
This passage is primarily about __________.___
A. the greenhouse effect
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【单选题】
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【单选题】
Why are some people against TV?___
A. Because TV programs are not interesting.
B. Because TV viewers are totally passive.
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【单选题】
One of the most obvious advantages of TV is that _________.___
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【单选题】
According to the passage, whether TV is good or not depends on ___________.___
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【单选题】
What regulation was issued by New York State concerning beverage containers?___
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【单选题】
The returned plastic bottles in New York used to _____________.___
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【单选题】
The key problem in dealing with returned plastic beverage containers is ______________.___
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【单选题】
Recycling has become the first choice for the disposal of rubbish because ______________.___
A. recycling causes little pollution
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