first approximation [计] 第一近似值
- And responses are a reasonable first approximation in evaluating marketing investment.
(消费者的)应是评价推销投资的第一手合理近似值。 - Equation(4-198) yields a first approximation for the change in the natural frequency of vibration.
方程(-98)出了一级近似下的固有振动频率的改变量。 - Through numerical calculation and experiments, conelution is made that these additional attenuations are quite small, which can therefore be neglected, in the first approximation.
因而在实际传输的条件下,光纤振动引起的附加衰减完全可以忽略。
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