The following are some examples of industries and fields in which Chinese companies may be using the ISO 9000 standard:

Manufacturing: Many manufacturing companies in China, such as automobile manufacturers, electronics manufacturers , machinery and equipment manufacturers, etc., usually adopt the ISO 9000 standard to ensure that their products meet quality requirements.

Construction and Engineering: Construction companies, engineering contractors, and related construction and engineering service providers may use ISO 9000 standards to manage project quality, control processes, and provide consistent quality assurance.

Food and beverage industry: Food producers, beverage manufacturers and related supply chain companies may adopt ISO 9000 standards to ensure that their products meet hygiene standards, food safety requirements and quality requirements.

Service industries: Businesses in service industries including financial institutions, healthcare organizations, consulting firms, etc. may use ISO 9000 standards to provide consistent service quality, improve processes, and meet customer needs.

It should be noted that these are just some examples of industries and fields that may adopt the ISO 9000 standard, and cannot exhaust all possible situations. In addition, a business's circumstances may change over time, so the most recent data may differ. For the latest information, please refer to relevant commercial databases, industry reports or data provided by official agencies.