The minimum detectable concentrations are less than 0.1 ppm for H2, O2 and CH4, and 0.5 ppm for CO.是什么意思_The minimum detectable concentrations are less than 0.1 ppm for H2, O2 and CH4, and 0.5 ppm for CO.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句