1. ʻO ke kūpaʻa ʻaʻahu maikaʻi: No ka mea, ua hoʻopaʻa ʻia ka paipu ceramic composite me nā seramika corundum (hiki i ka paʻakikī Mohs ke piʻi i 9.0 a ʻoi aʻe paha). No laila, ʻo ka media wili i lawe ʻia e ka metallurgical, ka mana uila, ka mining, ka lanahu a me nā ʻoihana ʻē aʻe he kūpaʻa kiʻekiʻe. Ua hōʻoia ʻia e ka indu ...
Heluhelu hou aku