The classificationofcost changes and measures to strengthen cost change control are described based upon the special features of cost changes in EPC projects.
根据工程总承包项目费用变更的特点，介绍了费用变更的分类，论述了加强费用变更管理的措施。
2
How to define training sample size and therefore select classifiers is a problem to solve in actual classification considering the costof acquisition of samples.
考虑到样本获取的代价性，如何根据训练样本的大小来选择有效分类器是实际分类中需要解决的问题。
3
To help view the product cost incurred by different level, a product family structure is represented by a hierarchical classificationof product cost.