第五章，采用高速匀浆法提取、柱层析法净化技术，成功建立了气相色谱质谱法同时测定银杏叶中5种有机磷农药残留量的方法。

Chapter five: A simple and rapid method was used to determine the residues of 5 organophosphorus pesticides in Ginkgo Biloba leaves by gas chromatography-mass spectrometry (GC-MS).

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采用火灾爆炸指数法对天然气净化厂生产装置进行了安全评估。

Using the method of fire and explosion indexes, a safety assessment is made of the production device in a gas-cleaning plant.

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