Why is model selection more important than calculation?

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Compared with calculation, the selection is much more important and more complicated. Because the calculation is just a simple formula calculation, it is not in itself the accuracy of the formula, but whether the given process parameters are accurate.

There are many contents involved in the selection. Improper selection not only causes waste of manpower, material resources and financial resources, but also has an unsatisfactory effect, which brings about some use problems, such as terrible reliability and longevity, operating quality, etc.