One question per day, the correct answer will be rewarded with 6 wealth, and the participant will be rewarded with 2 wealth； June 9
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multiple choice questions: Among the following statements about the division of hazardous areas of explosive gas environments and the scope of hazardous areas of explosive gas environments, which one is correct ( ) A. When the space in the factory is large and the amount of flammable substances released by the release source is small, the explosion hazard area can be demarcated according to part of the space in the factory. B. When the explosive gas hazard area is divided into Zone O, its risk level is lower than Zone 1. C. Good ventilation sign is the danger in the mixture The concentration of the substance is diluted to less than 30% of the lower explosion limit. D. The use of obstacles such as embankments or walls can limit the diffusion of explosive gas mixtures heavier than air and reduce the explosion hazard range. E. Effective ventilation can reduce a higher-level hazardous environment to a lower-level hazardous environment. Answer: A,D,E,
Among the following statements about the division of hazardous areas for explosive gas environments and the scope of hazardous areas for explosive gas environments, which one is correct (ADE) A. When the space in the factory is large and the amount of flammable substances released by the release source is small, the explosion hazard area can be demarcated according to part of the space in the factory. B. When the explosive gas hazard area is divided into Zone O, its risk level is lower than Zone 1. C. Good ventilation sign means that the mixture is medium-risk. The concentration of hazardous substances is diluted to less than 30% of the lower explosion limit. D. The use of obstacles such as embankments or walls can limit the diffusion of explosive gas mixtures heavier than air and reduce the explosion hazard range. E. Effective ventilation can reduce a higher-level hazardous environment to a lower-level hazardous environment.