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guarantee of required documents
文献资源保障
一个国家、地区或机构供给文献资料,满足文献情报需求以支持经济建设、社会发展和科学研究的能力。
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observe life and experience life
Observer
observer
observer bias
observer pattern
observer-report method
observers
observer's paradox
observing cage
observing chain
observing frequency
observing law of naturalness and cherishing truth
observing season
observing station
observing table
observing technique
observing technology of tilt tide
observing under ice
obsessive-compulsive disorder
obsessive-compulsive personality
obsessive-compulsive personality disorder
obsessive compulsive related disorders
obsidian
Obsidian Hydration Dating
obsidianite
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