A.3%-4%
B. 2%-3%
C. 5%-15%
D. 0.5%-1.5%
第4题
天然气和空气混合,当天然气浓度在一定范围内时,遇明火就会发生燃烧和爆炸。燃烧时,燃烧波的传播速度较慢,约0.3~2.4m/s,而爆炸时,会迅即产生高压高温,波速达到1000~3000m/s,对管线和容器的破坏力很大。天然气产生爆炸的浓度范围为5~15%,随温度、压力升高,爆炸浓度的上限提高,爆炸范围扩大。Natural gas and air mix, when the concentration of natural gas within a certain range, open fire will occur combustion and explosion. In combustion, the propagation speed of combustion wave is slow, about 0.3 ~ 2.4m/s, while in explosion, the high pressure and temperature will be generated immediately, and the wave speed reaches 1000 ~ 3000m/s, which is very destructive to pipelines and containers. The explosion concentration range of natural gas is 5 ~ 15%. With the increase of temperature and pressure, the upper limit of explosion concentration increases and the explosion range expands.
第6题
A.石油、天然气具有易燃、易爆、易挥发
B.石油液体产品蒸发的气体,与空气混合就可产生可爆炸气体
C.一定比例范围之内的混合气体一遇到明火就会产生爆炸
D.一定比例范围之内的混合气体一遇静电就会产生爆炸
第10题
A. 混合物中天然气浓度越高,越容易发生爆炸
B. 混合物中天然气浓度越高,越容易发生爆炸
C. 在与明火接触的条件下,只要空气中含有天然气就会发生爆炸
D. 混合物中天然气浓度在一定范围内
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