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。
Based on the results obtained from this analysis, a two-step precipitating and separating method to recover ammonium nitrate from the waste liquid has been developed.
在此基础上，研究成功一种“二步分级沉淀回收废液中硝酸铵”的方法。
Two kinds of methods of feature selection suitable for microcomputer systems-the correlation analysis method and the two-step- choosing method- is proposed.
提出两种适用于微机系统的特征选择方法——相关分析法和二步选择法；
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