unitization
unitize
unitized
unitizer
unitizing
unit-load
unit-mass
unit-of-use
unit-package
unitrain
  unit-step
unit-strength
unit-to-unit
unit-type
unit-weight
unit-wide
unity
unity-gain
uni-uni-valent
univariate
universal

    unit-step response

     реакция на ступенчатое возмущение

     переходная характеристика