It is different that the defective beer was recovered in packaging processes in each brewery.

Under the prerequisite to suppose that the inflow in a area is alimitless continuous Banuli test, based on the relative theories or Probabilitytheory and the basic principle of runs theory, the probabilitive distribution Rik(n)of a multiycar persistent nood disaster is studied that the run length is k years,and the solving equations arc given in this paper.

This model is based on the analysis of runs of the first order differences of daily runoff processes, therefore it is called the first order differences runs model, its abbreviation is FDR model.

An experiment on remaining bottom fermenting grain of different layers,different amount of liquor returning and caproic acid-producing bacterium for multi-fermentation substrate liquor was carried out.