After ultrosonic - extracting and isolating by column chromatograph, the samples were measured by GC/MS with selected ion monitoring mode.Some PAHs were identified and quantitated in samples.是什么意思_After ultrosonic - extracting and isolating by column chromatograph, the samples were measured by GC/MS with selected ion monitoring mode.Some PAHs were identified and quantitated in samples.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句