Primary fuels may be derived $q,$ or $q,$

The fuel$-$air mixture that contains less than the stoichiometric air quantity is called $q,$ while the mixture that contains more than the stoichiometric air quantity is called $q,$

Peat is not considered as coal because it $q,,$ and $q,$

The main hazard of coal storage is $q,$ which is essentially promoted by $q,$ and $q,$

Most of the heat liberated from combustion reactions is used to $q,$ while the remaining part of this heat is $q,$ or $q,$

Combustion of solid fuels is improved by $q,$

The affiliation of oxidizer molecules with the fuel is provided by $q,$ and $q,$