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(四) 1991年美国《石油文摘》第31卷 理目姓名年.长输管道中原油磁处理试验研究···································……’……梁长青等1990.海洋管道直接漂浮拖运分析·········……”’···……‘”·········……’
(D) the United States in 1991, “Oil Abstracts” Volume 31 directory name year. Long-distance pipeline magnetic treatment of crude oil in the pilot study ... ······················································································································· Liang Changqing et al 1990. Analysis of Direct Floating and Trawling of Ocean Pipelines ............... ... ... ... ... ’