实验过程中，他们将精油分散成各自的组成成分，用气体色谱分析法和质谱分析法进行分析。
To do this, the oils were broken into their component parts and analysed using gas chromatography and mass spectrometry.
气体环境：一个有限的空间如熔炉里的空气的组成成分。
ATMOSPHERE: Elements that make up the air in a confined locality such as in a furnace.
焊接工艺评定记录单上应包括封底焊时所用的惰性保护气体组成成分和流率。
The PQR shall include the composition and flow rate of the shielding and inert gas backing, when used.
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