Nnyocha gbasara arụmọrụ nke eriri cubic boron nitride (CBN)
Belt ịkpụ ájá, nke a maara maka ikike "ịkpụcha ihe dị iche iche" ha, na-enye ọtụtụ uru karịa ihe ndị e ji ejikọta ihe (dịka wiil ịkpụ), gụnyere obere mmepụta okpomọkụ, mmepụta ọkụ dị elu...
lee nkọwa zuru ezu