In order to highlight the importance of ensuring safe production and on-site operation during holidays and avoid artificial paralysis, hazardous chemicals enterprises should improve their operation management from the original level of hot work when they carry out hot work during holidays;

When the production system of hazardous chemicals enterprises is abnormal, many unsafe factors should be considered to reduce the probability of production accidents, and the management of emergency repair and hot work must be improved.

Therefore, the answer to this question is: hot work in holidays or abnormal production conditions should be managed (C upgrade).