第五，分层教学给教学管理和教学实践带来难度；
Fifth, level-teaching brings difficulty to teaching management and teaching practice.
本文采用分层次建模方法对制造信息资源集成化管理系统模型进行了研究。
The design of information resource network and application of management system in medicinal chain-business;
本文采用分层次建模方法对制造信息资源集成化管理系统模型进行了研究。
The design of information resource network and application of management system in medicinal chain-business;
应用推荐