Nonuniqueness of utility representing a preference relation,no significance of utility and marginal utility.
5."Chrestomathy " divide an order in all, ordinal for: ? of Chi of of Ь of cattail of the Kun that hold sacrificial meat high " the mystery that reveals nature " ;
6.Except the use of time relay to control the pressure maintaining and cooling, the rest all takes a route switch to control the ordinal operation and speed changes for each hydrocylinder.