First, this paper analyzes the reasons why we use long questionnaires in sample survey and its influence on data quality.
本文首先分析了在抽样调查中通常采用较长问卷的缘由，以及较长问卷对数据质量产生的影响。
This paper analyzes the reasons of parapet crack of brick structure, and puts forward the preventive measure and treatment.
文章对砖混结构女儿墙裂缝的成因进行分析，并提出了预防的措施和治理方法。
This paper analyzes the reasons of difficulty in demulsification and dehydration of super heavy oil during sewage recovery.
针对回收污水中超稠油破乳脱水困难等问题进行了原因分析。
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