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1.国外无缝钢管技术发展的特点近二十年来,世界各国新建和改建的各种无缝钢管机组情况列于表1。
1. Characteristics of Overseas Seamless Steel Tube Technology Development In the past 20 years, the situation of various seamless steel tube units newly built and rebuilt in various countries in the world is listed in Table 1.