In the meantime, we successively adopted some technology means such as mass spectrum analyses of remained gases, fast examination without decrease of chronic gas leak and helium mass spectrum leak hunting to look for lapse causes. 其间,我们先后采用了残气质谱分析、慢性漏气的快速无损检测以及氦质谱检漏等技术手段来寻找失效原因。