ANSI B36.19 tus qauv suav nrog stainless hlau seamless steel kav thiab welded steel kav.tab sis ANSI B36.10 tus qauv suav nrog seamless steel kav thiab welded steel kav.Cov yeeb nkab steel cov ntaub ntawv hauv qab no tuaj yeem siv los nrhiav cov yeeb nkab ntau thiab tsawg .d...
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