I te nuinga o te wa e rima nga waahanga o te hononga reke wera-wera, ara te waahi whakamahana, te wahanga endothermic, te wahanga whakawhiti, te waahi whakapiri me te waahi whakamatao.1. Te whakarite i te welding: tuu te paipa paipa i waenganui i te rawhi neke me te rawhi mau, me te tawhiti i waenganui i nga putorino paipa e rua me...
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