Ilana iṣelọpọ ti awọn tubes square jẹ rọrun, ṣiṣe iṣelọpọ jẹ giga, awọn oriṣiriṣi ati awọn pato jẹ oriṣiriṣi, ati awọn ohun elo yatọ. Nigbamii ti, a yoo ṣe alaye awọn iyatọ pataki laarin awọn tubes square welded ati awọn tubes onigun mẹrin ti ko ni oju ni awọn alaye. 1. welded square pip ...
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