下向分层进路回采  access-way stoping in the course of downward slicing

进路分层分条回采  slice drift and strip stoping

下向分层采矿法  underhand slice stoping; top slicing method; top slicing system

下向分层充填采矿法  Underhand cutting and filling method

下向进路  downward heading

下向进路采矿  underhand drift cut and-fill stopping

下向进路胶结充填采矿法  underhand drift cut-and-fill stoping

向下分层  Down hierarchical

改进层分法  active earth pressure

进路分层干式充填法  drift stoping method with dry backfill

冠向下法  Crown-Down technique

基层下层  subbase

简式目视进场下滑指示系统  0613

颏下进路  submental

空分下塔  Lower section of an air separation tower

眶下进路  infraorbital approach

目视进场下滑指示器  cloud lmages analysis

目视进场下滑指示系统  cloud luminance

平流层向下输送  tropopause folding