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不同牵引特性的内燃机车互相比较时，最好要考虑内燃机车在标定牵引工况和速度范围内的功率传递系数。只有这样才能获得比较客观的对比结果。作者在文内提出的指标换算公式能保证做到这一点。
Different traction characteristics of diesel locomotive compared with each other, it is best to consider the diesel locomotive traction in the calibration conditions and speed range of power transfer coefficient. Only in this way can we get more objective comparison results. The formula of the indicator proposed by the author in the text can guarantee to do this.