Ngwakọta PCBN nke Boreas: Na-agbanwe arụmọrụ igwu mmanụ
N'ụwa siri ike nke igwu mmanụ, ebe arụmọrụ, ogologo oge, na arụmọrụ dị oke mkpa, ngwakọta Boreas PCBN (Polycrystalline Cubic Boron Nitride) pụtara ìhè dị ka ihe na-agbanwe egwuregwu. Injin...
lee nkọwa zuru ezu