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1·In order to control frequent element deficiency diseases, effects of spraying nutrient elements on Pistacia veraL.

为防治大棚育苗期间阿月浑子常见的各种缺素症，进行了营养元素喷施试验。

2·Experiments show that a surface treatment process forming a protective coating prevents the pit-formation and extends the service lives in se veral folds.

试验已经充分证明：气阀上采用一种表面处理方法所得到的涂层可以有效地减少并推迟“麻坑”的产生，数倍地提高了使用寿命。

3·This paper analyzes the failure character and failure reasons of the reinforced concrete columns and presents se veral methods of strengthening the reinforced concrete columns.

本文分析了钢筋混凝土柱的破坏特征及其破坏原因，并分别介绍了几种常用的加固混凝土柱的方法及其构造与施工要求。