当可燃气体与环境空气混合并达到一定浓度时，遇具有一定温度的火源（）发生爆炸。

B、热度

C、温度

B．不能

此题为判断题(对，错)。

A. 燃烧正常；

B. 连续燃烧的必须；

C. 连续燃烧最低；

D. 燃烧最低。

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.

A. 闪点

B. 自燃点

C. 着火点

D. 挥发点

A. 闪点

B. 燃点

C. 自燃点

D. 着火极限