Kev siv lub tshuab raj ncaj ncaj siv: feem ntau yog siv rau kev ua cov xov ntawm cov tshuab lathes zoo tib yam, cov tshuab drilling thiab tapping tshuab, thiab txiav ceev yog qeeb. Nyob rau hauv high-hardness ua cov ntaub ntawv, cov ntaub ntawv uas yuav ua rau cov cuab yeej siv, txiav hmoov cov ntaub ntawv, thiab los ntawm lub qhov muag qhov muag qhov wi ...
Nyeem ntxiv