Slogans such as "Please turn off the gas and refuel" and "Please don't use your mobile phone" are hung at gas stations all the year round. This requirement is to prevent sparks from igniting gasoline

Slogans such as "Please turn off the gas and refuel" and "Please don't use your mobile phone" are hung at gas stations all the year round. This requirement is to prevent sparks from igniting gasoline and causing fire, because A

Test analysis: At normal temperature, gasoline is easy to vaporize, and the air around the gas station is full of gasoline vapor. If there is an open flame, it is easy to cause an explosion. Therefore, gas stations have slogans such as "Please turn off the gas and refuel" and "Please don't use your mobile phone".

So choose a.

Comments: This question mainly examines students' understanding of vaporization and explains some phenomena in life with vaporization knowledge.