ʻO nā ʻano mea like ʻole o nā pahu puhi e hilinaʻi ʻia i nā pahu puhi ponoʻī, hiki ke hana ʻia me ke kila manganese, ke kila martensitic structural (martensitic steel), ke kila chrome, a i ʻole nā mea hoʻohui metala matrix (MMC, e like me ka ceramic).Hoʻokumu ʻia nā MMC i nā ʻano kila like ʻole a me nā ʻano ʻano cera ...
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