Some occupations in this unit group may require a specific licence or certification, such as a stationary engineer's licence or refrigeration certification.
本单元组某些职业可能需要专业许可或认证，如工程师执照或制冷认证。
Some occupations in this unit group may require a specific licence or certification, such as a stationary engineer's licence or refrigeration certification.
本单元组某些职业可能需要专业许可或认证，如工程师执照或制冷认证。
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