By investigation and inspection, the analysis and evaluation were made for the source and harm of the combustible gas, so the tunnel construction was guaranteed.
通过调查、检测对可燃气的来源、危害性等进行了分析评价，保证了隧道施工。
By investigation and inspection, the analysis and evaluation were made for the source and harm of the combustible gas, so the tunnel construction was guaranteed.
通过调查、检测对可燃气的来源、危害性等进行了分析评价，保证了隧道施工。
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