back-to-back connexion back turbine back-type parachute back-up backup astronaut back-up brick back-up compo backup device back-up engine back-up lamp back-up light back-up protection backup weld back valve back view back voltage backwall backward acceleration backward-acting regulator backward-and-forward bending test |
back-to-back connexion елн. кръстосано съединение Търсената дума е намерена |