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directional filter
el. 方向〔分向〕滤波器
mil., air.def. 方向定向滤波器
space 定向滤波器
tech. 分带网络
telecom. 方向滤波器; 分向滤波器
directional separation filter
mil., air.def. 定向间隔滤波器
directional filter: 5 phrases in 4 subjects
Air defense1
Electronics1
Technology2
Telecommunications1