<p style="text-align:justify">GC/MS is widely used to describe lower-molecular-mass compounds with relatively high volatility and less polarity in coal-derived liquids. With extremely high resolution power representing full width in the upper half of the mass spectrometry) and high mass accuracy. Application of gas chromatography / mass spectrometry in the study of separation and determination of companion gas compounds, organic gases in coal, explosive mines</p>
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