1. ʻO wai ka mea i ʻoi aku ka maikaʻi o ke kūpaʻa hopena, yg+15 a i ʻole yg+20: YG15 a me YG20 ʻelua mau māka o ka carbide sima.ʻAʻohe maikaʻi a maikaʻi ʻole paha, pili wale ia i ka manawa āu e hoʻohana ai.Aia ka YG15 ma kahi o 15% cobalt, ʻoi aku ka paʻakikī ma mua o YG20, a ʻoi aku ka ikaika ma mua o YG20.2. ʻO wai ka mea maʻalahi ...
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