延安市中学生体育锻炼影响因素的调查研究_文档下载_文档资料库 关键词： 延安市；中学生；体育锻炼；影响因素 [gap=706]Key words: Yan'an; middle-school student; physical training; influencing factor
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目的：评价延安市消灭脊髓灰质炎工作的策略与效果。
Objective: To assess the effect of strategies used in eradicating poliomyelitis in Yanan.
延安市是一座依山傍水的河谷城市，有着特殊的地形特点。
Yan 'an City, which is situated near to hills and beside rivers, has its special geological features.
通过对延安市北沟小流域典型坝地土壤养分的测定，分析比较了其土壤养分时空分布特征。
Based on comparative analysis on spatial temporal distribution characteristics of soil nutrients of typical dam land in Beigou small watershed of Yan 'an City.
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