如题所述
æ ç¼é¢ç®¡ï¼seamless steel pipe; seamless steel tube
æç¼é¢ç®¡å°±æ¯ç管ï¼åºè¯¥æ¯: welded steel pipe/ welded steel tube
æç¼é¢ç®¡å°±æ¯ç管ï¼åºè¯¥æ¯: welded steel pipe/ welded steel tube
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