Te nuinga o te wa he witi pai te paura metallurgy tungsten, ko te nuinga o te waa ka kowhiria e te whakamahana teitei o te pāmahana me te tikanga hurihuri, ka whakahaerehia te pāmahana i waenga i te 1500 ~ 1600 ℃.I muri i te watea, ka taea te huri, te hanga, te miro ranei te tungsten.Ko te perehi...
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