1. High-speed steel hniav, yog ib qho ntawm cov khoom siv cutter hniav, piv nrog rau lwm cov ntaub ntawv, high-speed steel hniav muaj tus nqi qis dua, yooj yim rau txheej txheem, siab zog thiab lwm yam zoo.HSS hniav tuaj yeem siv rau hauv cov duab sib txawv thiab qhov ntau thiab tsawg kom tau raws li qhov sib txawv cu ...
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