horizontal directional drilling horizontal directional drilling technology
active field directional ranging
adaptive directional algorithm
Adaptive Directional Filter
adaptive directional line differential protection
adaptive directional weighted median filtering
advance directional sign
air directional drilling
antenna directional characteristics
天线指向特性
天线方向特性
延迟性可逆性缺血性神经机能障碍
antenna directional diagram
apparent directional angle
asymmertry directional window
Bethe-hole directional coupler
BHA directional behavior
bi -- directional loading
Bi directional effection
bi directional per survivor processing
bi- directional triode thyristor