厚透镜的会聚性和发散性与其厚度有何关系?
What is the relation between gathering and scattering of thick lens and its thickness?
提供了用于调整投影电视的会聚性的装置和方法。
Provided are apparatus and method for adjusting a convergence of a projection television.
当季节性降雨开始,雨水便会聚集在砂坝之后。
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