【Key words】 eco-agricultural model; developmental principle; integrated technology; demonstrating; spreading; Hunan province
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This study was designed to investigate the developmental principle and characteristics of pencil grasps in preschool children by mean of their drawing circles.
以握笔画圆为测查任务,考察了学龄前儿童握笔姿势的发展趋势及特点。
This review summarizes the fundamental principle of ion mobility spectrometry (IMS). New progress is presented and commented in detail. Furthermore, t he developmental trend of IMS is also discussed.
本文简要介绍了离子迁移谱的基本原理,对近年来离子迁移谱技术的最新进展进行了较为详细的评述,并对未来的发展趋势作了展望。
The basic principle of atmospheric ozone layer destruction hy polyurethane blowing agent CFC-11, and various way, developmental trend and economic feature of substitution for CFC-11 were reviewed.
简述了CFC - 11对大气臭氧层破坏的基本原理,介绍了聚氨酯cfc - 11替代的不同途径及发展趋势,评价了CFC - 11替代的经济特性。
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