Spiral submerged arc welded steel pipe ka linako tse ling e kopana le maemo a mang ts'ebetsong ea tlhahiso, joalo ka masoba a moea.Ha ho e-na le masoba a moea ka har'a seame ea ho cheselletsa, e tla ama boleng ba liphaephe, e etse hore phaephe e lutle le ho baka tahlehelo e boima.Ha phala ea tšepe e sebelisoa, e tla ...
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