Drill down operator of association rules, which follows the same concept of OLAP, can analyze the association rules and mine its son association rules.
关联规则的下钻操作沿袭了OLAP中的下钻的概念，它是通过对已经挖掘得到的用户感兴趣的规则进行再分析，挖掘出用户感兴趣的子关联规则。
The selection and master design of guide drill tool are important problems usually met by field drilling operator and manufacturer.
导向钻具的选型与总体设计，是现场钻井工作者与制造厂家经常碰到的重要问题。
The selection and master design of guide drill tool are important problems usually met by field drilling operator and manufacturer.
导向钻具的选型与总体设计，是现场钻井工作者与制造厂家经常碰到的重要问题。
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