通过研究背景和文献综述论述了构建网络有效教学模式的必然性，并介绍了本论文的研究思路、内容和方法；
This chapter mainly discusses the necessity of building effective teaching mode, as well as describes the ideas, contents and methods it takes.
在对浅层套管封堵失效原因深入分析的基础上，在“先建网，再封堵”的思路指导下研制了新型堵剂。
Base on the analysis about the reason of failure plugging, a new type chemical plugging agent was manufactured by the way of "plugging before net-setting".
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