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未做任何加工处理,由事件的见证人或第一记录者在事件发生时创建的信息。人类社会实践活动中直接产生或得到的各种数据、概念、知识、经验及其总结,客观而又直接地反映了事物的真实情况。又称一次信息。
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characteristic ray
characteristic ray cone
characteristic ring
characteristic root
characteristics
characteristics and evaiuation of industrial catalyst
characteristics and patterns of urban spatial structure in China
characteristic section of stage
characteristic sensitivity
characteristic sequence
characteristic series
characteristic set
characteristic singularity
characteristics method
characteristics of chemical industry accidents
characteristics of Chinese urban ethnic culture
characteristics of cleanroom
Characteristics of direction
characteristics of forestry economy
characteristics of hydrodynamics
characteristics of low-light level night vision imaging device
characteristics of mineral resources
characteristics of plant community
Characteristics of service operation management
characteristics of shale gas
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