§2-3液流的连续性方程 ( the continuity of equation of liquid 、液流的连续性微分方程 (differential equation of continuity of liquid 如+p(m+2+m)=0 Ox / 不可压缩液体的连续性微分方程( differential equation of continuity of incompressible fluid + O O§2-3 液流的连续性方程 （the continuity of equation of liquid） 一、液流的连续性微分方程 (differential equation of continuity of liquid) 不可压缩液体的连续性微分方程(differential equation of continuity of incompressible fluid) + ( + + ) = 0       z u y u x u d t d x y z   d dt = 0 + +  = 0      z u y u x ux y z u x x u x x      + ( ) x u x z y 