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Research, Development, Test and Engineering
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busin.
研究、开发、测试与工程
research, development, test and engineering
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avia.
研究、发展、测试与工程
research, development test and engineering
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研究、开发、实验和工程〔鉴定〕
research, development, test and engineering
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研究、开发、试验和工程
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