Trigonometric function is one of the most important contents in maths in senior middle school. New teaching material was abridged in the base of original teaching material.
三角函数是高中数学重要的内容之一，新教材在原教材基础上作了缩简。
And analyze some types of grade eight physics original teaching material about different time, dig out the main science methods, and carry on comparison, for the purpose of reference.
对不同时期几种八年级物理原始教材进行分析，挖掘出其中的主要科学方法，对其进行比较，以供参考。
Owning to the deficiency of the original experiment method on the teaching material, the rational improvement scheme has been designed, proved the good experiment result.
针对教材上原实验方法之不足，设计了合理的改进方案，收到了良好的实验效果。
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