Amagama angundoqo: Umbhobho we-API ongenamthungo, umbhobho we-API SCH 40, i-ASTM API 5L, umbhobho we-carbon steel API n amashishini ahlukeneyo afana neoli kunye negesi, i-petrochemical, kunye nokuvelisa, ukukhethwa kombhobho ochanekileyo wokuthuthwa kwamanzi kubalulekile. Umthungo we-API...
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