Hana mua ka hana hao i ka hao. Mai ka hao puaʻa mai ke kila. ʻO ka hao puaʻa i loaʻa ma ka hoʻoheheʻe ʻana i ka hao hao he kiʻekiʻe ka nui o ka carbon content a loaʻa i nā mea haumia he nui (e like me ke silicon, manganese, phosphorus, sulfur, etc.). No laila, nele ka hao puaʻa i ka plasticity a me ka paʻakikī, loaʻa nā waiwai mechanical maikaʻi ʻole, a me ka ca ...
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