欧美前后双插1区,久久精品国产亚洲夜色av网站,超碰午夜性爱,东京香蕉dvd,欧美日韩性生活片,无码精品人妻一区二区三区涩爱

防爆電氣CCC認證中，關鍵元器件有劃分為A類受控和B類受控。那么，A類和B類是如何劃分的？A類受控和B類受控又分別是哪些元器件呢？ A類受控元器件：A類變更應經(jīng)過認證機構的批準。變更時，整機是否符合安全要求，必須由實驗室按照整機和 元器件標準中相關項目所規(guī)定的試驗進行確定，并由認證機構評定合格后批準變更。 ……

※ Data preparation ◆Business license ◆Application form ◆Product drawings (including product specifications, label, circuit diagrams, PCB drawings, gene……

※Background Explosion protection is an essential part of the overall risk management to be conducted for industrial sectors such as coal mining, oil, gas and……

(1）IEC 60079-0 Explosive atmospheres Part 0: Equipment —— General requirements （2）IEC 60079-1 Explosive atmospheres Part 1: Equipment protection by flameproo……

ATEX Certification is the product regulation that supports health and safety of persons working in or near to potentially explosive atmospheres such as those found in the petrochemical industries, underground mining or in food production. ATEX Certificati

※ Data preparation ◆ Business license ◆Application form ◆Product drawings (including product specifications, label, circuit diagrams, PCB drawings, gen……