方位角-仰角指示器
azimuth elevation indicator
地面电子降落设备
ground-based electronic landing aid
地下水降落漏斗
Groundwater cone of depression
depression cone of groundwater level
地下水面降落锥
Cone of water-table depression
cone fisher
地下水位降落
lowering of the underground water level
groundwater depression
lowering of ground water level