[taregg]

exsample 1.high explosive like TNT
                 2.low explosive like smokeless powder
                 3.( ! )   explosive  like gasoline or desel

[Bored chemist]

You seem to have got those the wrong way round. TNT is a high explosive.
Gasoline doesn't (ordinarily) explode.Mixtures of gasoline vapour with air will deflagrate when ignited.
In some cases that deflagration may become a detonation.
It's complicated
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[taregg]

 is it mean fuel gases is.... slow deflagration
and gun powder is ........ fast deflaration..

[johnab1]

An explosive is a high explosive if it reaches a supersonic velocity when energy is released. This is detonation.
Low explosives do not detonate, they burn or deflagrate. Energy is released at a subsonic velocity.
TNT is a high explosive, while gunpowder is a low explosive. In order for gunpowder to explode, it must be in a container. This is known as a mechanical explosion.

[Lmnre]

This question seems related to the term ...sorry, you cannot view external links. To see them, please REGISTER or LOGIN in car engines provides a common example of transitioning from deflagration to detonation.