使用罐装液化气劫持人质案件，这几年在我国频频发生，因处置方法不当，曾造成严重后果。
The hostage-taking cases by using canned liquefied petroleum gas have happened for these years in our country frequently.
实践和资料说明，罐装泡沫样聚气录井方法是泡沫钻井中气测录井的另一种行之有效的方法。
Practice and results show that the gas survey method with a gas-collecting tank for foam drill fluid samples is another effective method.
绝对不要使用任何罐装压缩空气或液化气清洁感应器。
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