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跟踪观察研究
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跟踪观察研究
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跟踪观察研究
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longitudinal study
跟踪观察研究
为了研究某一研究对象发展历程或生命周期中的状况,选定合适的观察样本,沿着事实动态发展的轨迹,进行观察,从而探寻其各个发展阶段的规律。又称纵向研究。
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paper electrophoresis
paper feeder device
paper folding
paper folding constant
paper-folding film
paper grammage
paper index and citation
papering work
paper jam
paper machine drive control system
paper machine system
paper-making
papermaking
Paper Making Blankets
papermaking control system
paper making felt loom
paper making felt needle machine
papermaking from wood pulp
paper making industry
papermaking wet laid nonwoven
Papermaking Workshop at Hualin
paper mallet vase
Paperman
Paper Map from Fangmatan,Tianshui
Paper Map Unearthed from Fangmatan
科学参考收录了854744条科技类词条,基本涵盖了常见科技类参考文献及英语词汇的翻译,是科学学习和研究的有利工具。
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