The primary coverage includes: the characters and the detailed process of the problem-based learning model, the experimental study and the teaching suggestion on it.
主要内容包括：问题导向学习模式的特征，具体操作流程，实验研究和教学建议。
The primary coverage of the dissertation includes:(1) Light microscope is used to observe the microstructure.
论文主要内容包括：1、利用光学显微镜测试了试验钢变形前后的组织。
The first chapter mainly includes the background, researching purpose, meaning, basic thought, methods, primary coverage, conclusion, the character and the defects.
本文首先说明了论文的选题背景、研究目的与意义、研究的基本思路和策略、研究的主要内容、研究的特色和不足等。
The first chapter mainly includes the background, researching purpose, meaning, basic thought, methods, primary coverage, conclusion, the character and the defects.
本文首先说明了论文的选题背景、研究目的与意义、研究的基本思路和策略、研究的主要内容、研究的特色和不足等。
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