single track single-track heading single-track tape recorder singlet state singlet term single-type composition single-u butt weld single-u groove single-valued function single-valued transformation single-valved single-v butt weld single-vee groove single vernier single vortex single vortices single-way railway single-way rectifier single-way switch single-wheel pelton turbine |
single track ак. еднопистов запис единичен релсов път Търсената дума е намерена |