The chosen masterpieces should be fit for the junior students in the areas of their psychology and physiology.
2
针对人教版选修教材中简谐运动实验中的不足，对该实验装置进行了改进。
Aiming at the deficiency of simple harmonic motion in materials, author puts forward some measures to improve the experiment of simple harmonic motion.
3
第一章：对现有中学语文教材（人教版）中的悲剧性作品的分类。
The first part: Classification to the tragic works in the existing teaching material middle school (People's Education Press).
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