First step, adopting Cluster Analysis Method and utilizing data in 1990 and 2000, 17 regions in Shandong Province has been classified into 3 types according to society - economic type.
第一吗步，采用聚类分析法，利用1990年、2000年资料，对山东省17地市进行社会经济类型的分类，均划分为3个类型。
Risk analysis is a premise in adopting safe measure to computer. Its method and step are described in this paper.
风险分析是实施计算机安全措施的前提。本文叙述风险分析的方法和步骤。
This article introduces the reason of the oil well scaling, the principle of the chemical cleaning and protection, two step treatment program and method, analysis of the treatment efficient.
本文简要介绍了油田油井结垢的成因、化学清洗及防治的机理、两步法施工工艺方法、施工效果分析。
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