轧制后的轧件长度与轧制前的轧件长度之比叫延伸系数。
研究表明，最小压缩比（延伸系数）可定为4。
The result shows that the minimum compression ratio(elongation factor)is 4 as determined.
根据实际计算结果，讨论了延伸系数的取值范围。
Based on the results from our practical calculation, the paper discusses the sampling range of the lengthening coefficients.
在两合机器的情况下，当延伸系数允许取两个不同值时，该问题已被证明是难问题。
The problem is known to he NP-hard when the waiting-time extension coefficients have two arbitrary values.
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