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什么叫LEL和PPM

添加時(shí)間 : 2018-03-14 15:44:00

瀏覽量 : 3183

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LEL的意思是可燃?xì)怏w爆炸下限濃度值，一般用體積百分比表示。

PPM的意思是百萬(wàn)分之一。

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