Ngwa igwe na-arụ ọrụ ngwakọta na-akọwapụta workpiece na kaadị iji wuchaa ọtụtụ ma ọ bụ usoro nhazi niile, ka ibelata ngwaọrụ igwe na ihe ndozi, melite nhazi nhazi workpiece, belata usoro nhazi ma chekwaa mpaghara ọrụ.
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