1、幻灯片20-40张，
2、时间10-15分钟，回答问题时间3-7分钟；其中题目和背景介绍2-4张、材料方法技术路线2-4张、图表10-20张、总结和分析3-6张、优缺点前景规划1-3张、致谢1张。
Contents and slide No. for PPT in defense :
1、Results and its discussion are key contents of PPT for defense.
2、Title and backgroud 2-4 slides, methods and pathways 2-4 slides, figures and tables 10-20 slides,summary and analysis 3-6 slides, shortcoming and future plan 1-3 slides.
