针对程序员修复的缺陷进行的测试属于（）。

单项选择题Read the following sentence and Identify the function of it in the introduction. In this paper we develop a model for trajectory planning of airvehicles. () A、Explaining the significance or necessity of the research B、Reviewingthe existing literature relevant to the present study C、Identifyinga gap in the existing literature D、Announcing the purpose focus ofthe study E、Outlining the paper structure

多项选择题关于《论十大关系》的表述正确的有：（）