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电焊、气焊要严格执行操作制度，明火作业应有专人看守；
Welding and geo-drilling must be strictly implemented operation system, due to special guard over homework.
youdao
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电焊、气焊要严格执行操作制度，明火作业应有专人看守；
Welding and geo-drilling must be strictly implemented operation system, due to special guard over homework.
youdao