10月9日是列夫·埃里克森之日（Leif Erikson Day），这个日子是纪念大约在公元1000年左右，维京（或者是挪威）开拓者带着他的船员成为第一个有史以来登陆到北美的欧洲人。
October 9 is Leif Erikson Day, honoring the Viking (or Norse) explorer who sailed his crew to the first recorded landing of Europeans in North America around the year 1000.
在理论分析和实测资料的基础上，作者肯定了谢维·列夫公式能用来分析和计算塑料管的水头损失。
Based on the analysis of hydraulic theory and experimental data obtained by author, it is confirmed that Chevielev's formula can be used for computing the hydraulic head loss of plastic tubes.
在理论分析和实测资料的基础上，作者肯定了谢维·列夫公式能用来分析和计算塑料管的水头损失。
Based on the analysis of hydraulic theory and experimental data obtained by author, it is confirmed that Chevielev's formula can be used for computing the hydraulic head loss of plastic tubes.
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