In this paper, we shall deal with finite energy weak solutions of the problem (1.1) (1.3) on a certain time interval I/R, specifically, the functions * 0, u belong to the classesthe equations (1.1), (1.2) hold in D$(I_0), and the energy inequality d dtis satisfied in D$(I), where the energy E is given by the formulaMoreover, we shall assume * # L 2 loc (I; L 2 (0)).(1.6)