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ICS 77.140.75 H 48 YB · 本标准由中国钢铁工业协会提出。 本标准由全国钢标准化技术委员会(sac/tc 183)归口。 本标准起草单位:衡阳华菱钢管有限公司、浙江伦宝金属管业有限公司、长沙大力神液压工程有限
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