The focus of this study is that how to change the status of effective teaching practice and insist on the principle of the validity of effective teaching in the process of implementation.
如何改变有效教学的实践现状，在有效教学的实施过程中始终坚持正当性原则，是本研究的重点。
Case change principle entitles the judge to denying the free jurisdiction of contract force on the basis of fairness principle in practice, but there are misunderstandings in legal practices.
情事变更原则实际上赋予法官根据公平原则否定合同效力的自由裁量权，司法实践中对该原则存在误解。
Based on the fundamental principle about the change of dart and its use in practice, the form of dart line in womens costume is elaborated.
简述了女装上衣省道转移的基本原理，并结合实践分类论述了原型省道分解形式；
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