Very few students solved this question correctly. It is a very simple application question, using two formulas from the text.
做对这个题目的人很少。这是一个简单的应用题，要用到书中的两个公式。
In this paper, a simple approach is introduced to simulate the performance of erbium doped fiber amplifiers by using two empirical formulas.
本文首先用两个经验公式，介绍了一种用于模拟掺饵光纤放大器性能的简单方法。
The effect of super fine active zinc oxide in radial passenger car tire tread were investigated by using two formulas.
对超细活性氧化锌在轿车子午线轮胎胎面胶中的活化效果分两组配方做了试验。
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