(1) energy device, executive device, control and adjustment device, auxiliary device, working medium (note that the words may be slightly different);

(2) Flow and stillness

(3) Dynamic viscosity, kinematic viscosity and relative viscosity, kinematic viscosity, 40℃, kinematic, 32mm? /s

(4) Petroleum hydraulic oil, emulsified transmission fluid and synthetic transmission fluid.

(5) small, friction, big, leakage

(6) Static pressure head, potential energy head, P2 = p1+ρ g (z1-z2)-Note: there are also static pressure energy and potential energy in the first two places, and the expressions of the equations are different.