六从事缺氧危险作业致有立即发生缺氧危险之虞时
When there is an immediate risk of hypoxia due to hypoxic hazardous operations
以上为机器翻译结果，长、整句建议使用 人工翻译 。
六从事缺氧危险作业，致有立即发生缺氧危险之虞时。
When an operation is performed where oxygen may be deficient, danger of asphyxiation may occur imminently;
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