국가과학기술표준분류체계 개선을 위한 사전 기획연구

국가과학기술표준분류체계 개선을 위한 사전 기획연구

203 Pages · 2011 · 2.49 MB · Korean
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“ The best time to plant a tree was 20 years ago. The second best time is now. ” ― Chinese Proverb
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