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design, development, test and evaluation
avia.
设计,研制,试验和鉴定
;
设计、研制、试验和评估
earth.sc.
设计、研制、试验与鉴定
space
设计、研制、试验和鉴定
English thesaurus
design, development, test and evaluation
abbr.
ddt&e
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