In research methods, adhere to the materialist conception of history as a guide, not only revealed many aspects, but also focused: Both longitudinal study, but also horizontal comparison.
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Both studies are based on the longitudinal HUNT 2 Nord-Tr? Ndelag Health Study conducted between 1995 and 1997.
两项研究都基于北特伦德·拉格郡纵向HUNT T 2健康调查1995年至1997年间的数据。
So it is significant both in theory and in practice to further study the deformation mechanism of steel ball by longitudinal rolling in the deformation process.
对于这种新的成形方法，深入探讨其成形过程的变形机理具有重要的理论和实际意义。
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