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See Chinese contents: GB 12456-2021 GB 12456-2021: National food safety standard - Determination of total acid in foods
This Standard specifies the terminology, classification, technical requirements, test methods, inspection rules, and identification of gas monitors and alarms for workplaces. This Standard is applicable to the production and use of monitors and alarms for flammable gas, toxic gas and oxygen in workplaces within the territory of the People Republic of China. The monitors and alarms used in other special places shall also be implemented this Standard in addition to otherwise specified in the relevant standards.
