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成本归集--成本积累
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research and development cost
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research and development (R&D)
research and development--research and development (R & D)
research and development--research and development (R & D)
Research and Development--Research and Development (R & D)
research and development--research and development (R & D)
research and development--research and development（R & D）
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research and development（R & D）
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