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대중소형 �5동기怎样区分大中小型制冷机

2018-07-14View Original

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특종작업원 안전기술 훈련 검정 규정에 따르면 대중형 냃동기 운전운영공은 자격증이 필요합니다. 그럼 소형 냃동기的操作人员是否也需要取证??怎样区分大中小型制冷机??

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