Define and compare the following pairs of terms in the context of electromagnetic stepper motors:
(a) Pulses and steps
(b) Step angle and resolution
(c) Residual torque and static holding torque
(d) Translator and drive system
(e) PM stepper motor and VR stepper motor
(f) Single-stack stepper and multiple-stack stepper
(g) Stator poles and stator phases
(h) Pulse rate and slew rate