Re ikhethetse ho etsa lipeipi tsa tšepe tse cheselitsoeng le li-tubes. Re fana ka e ka fihlela maemo a machabeng joalo ka: ASTM, JIS, DIN, EN, API, BS, Tlhahiso ea k'hamphani ea rona e etsoa ho latela TS EN ISO 9001:2000, API5 L, ISO 14001:2004 le ISO9001,SGS Integra. ...
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