Ob qho tib si precision sib tsoo thiab super precision sib tsoo yog cov txheej txheem kawg ntawm cov pob steel.Super precision sib tsoo cov txheej txheem feem ntau yog siv rau cov pob steel siab dua G40.Qhov kawg loj sib txawv, geometric raug, nto roughness, nto zoo, ...
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