Kev txiav txim siab engineering, khoom alloy steel yeeb nkab A333 GR6, specification yog 168.3 * 7.11, thiab carbon steel yeeb nkab GB / T9948, 20 #, specification yog 114.3 * 6.02, thiab lwm yam. Cov nram qab no qhia cov qauv thiab cov ntaub ntawv uas engineering xaj yuav ntsib: 20 #GB8163...
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