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도움 요청

2016-03-09View Original

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그 표준 NB/T47014의 용접 평가 요인에 관한 내용에서, 전류의 종류나 극성을 변경하는 것은 와이어 아크 용접에 있어서 보조적인 요인이면서 동시에 부차적인 요인이라고 하는데, 이걸 어떻게 이해해야 할까요?

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