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essential item

强调
军队, 后勤 Item that meets the following operational criteria: 1. essential for the operational use of the equipment; 2. repairable or exchangeable at the NTI1 and NTI2 maintenance levels less 12 hours. (FRA)
essential item
: 3 短语, 3 学科
军队1
大规模杀伤性武器1
航天1