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Трамп высказался о сроках войны с Ираном01:42
In the derivation, we find that the mean free path λ\lambdaλ is inversely proportional to this area and the number of molecules per unit volume (nnn). However, because all molecules are moving (not just one), we add a factor of 2\sqrt{2}2 to account for the average relative velocity.。业内人士推荐PDF资料作为进阶阅读