ld
abbr. 检漏器(=Leak Detector)abbr. 负载(=load)abbr. 当地交付(=Local Delivery)
abbr.
1. =lethal dose 致死剂量
2. =line of departure 掷线, 发射线; 进攻出发线; 空中搜索起始线
3. =low density 低密度