This article introduces the using condition and developing trend of common standards of steel pipe used for petroleum and nature gas transmission in China, Euramerica and Russia.
介绍了目前中国、欧美和俄罗斯常用油气输送钢管标准的使用情况及其发展趋势。
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The paleogeography was dominated by the supercontinent of Gondwana to the south, the continent of Siberia to the north, and the early formation of the small supercontinent of Euramerica in between.