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我们在做了很多习题后,总能悟出一些结论或解题技巧,它们对后面的学习是很有用的．本文对此作整理如下: 1．光学 (1)入射光线的传播方向不变,平面镜绕
After we have done a lot of exercises, we can always find out some conclusions or problem-solving techniques that are useful for later learning. This article is organized as follows: Optical (1) The direction of the incident light does not change.