Izinsimbi eziningi nezinhlanganisela zazo kufanele zenziwe zibe amafilimu amancane ngaphambi kokuba asetshenziswe emikhiqizweni yobuchwepheshe efana ne-electronics, izibonisi, ama-fuel cell, noma izinhlelo zokusebenza ze-catalytic.Kodwa-ke, izinsimbi "ezimelana", kufaka phakathi izakhi ezifana neplatinum, iridium, ruth ...
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