open-face
open-file
open-flame
open-flow
open-frame
open-gate
open-grained
open-grid
open-hearth
open-hole
  opening
open-jaw
open-lap
open-link
open-loop
open-mouth
open-neck
openness
open-office
open-pass
open-phase

    opening strength

    устойчивость горной выработки