defencesn.防御工事名词defence的复数形式.=defenses.defencen.防御；答辩；防务Defence Communication Network国防通信网Defence Industry Productivity国防工业生产率Defence Transportation System国防运输系统Defence Union of South Africa南非防御联盟Defence Communications Agency国防通信局Defence Surplus Sales Officer国防剩余物资销售官Defence Investigative Service国防调查局Defence Industries Exhibition国防工业展览Defence Information Memorandum国防信息备忘录Defence Planning Questionnaire防务计划(审核)调查表