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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;
youdao
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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;
youdao