The refraction effect complex operation can be greatly simplified by using equivalent earths radius; therefore it is widely available in the actual project.
等效地球半径的使用可大大简化电波在大气中传播时折射效应的复杂运算，因此在实际工程中获得广泛应用。
The principle and operation method of determining the cleaning solution consistency in cleaning machine by light refraction are outlined in this paper.
介绍了用光折射法测定清洗机中溶液浓度的原理和方法。
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