Considering that we would like to discuss the rule of the burned are and the number of fire engines needed to be dispatched
when great property loss is caused, the cases are screened based on the following principles:
(1) Exclude the fire cases with heavy casualties.
(2) Try to select the fire cases happened in types of buildings with great property loss, such as shopping malls, stores,
markets, warehouses, factories and so on.
Finally in this section 124 serious fire cases are chosen to do further research, which include 32 shopping mall type cases,
20 market type case, 31 warehouse type cases and 41 factory type c