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In underground construction, proper ventilation is crucial to ensure the health and safety of workers. Underground works, such as tunnels, mines, and basements, often involve limited natural airflow, making mechanical ventilation necessary. Adequate ventilation helps remove harmful gases, dust, and fumes generated from explosives, machinery, or chemical processes. Fresh air supply should be sufficient to maintain oxygen levels, dilute ____ __________ ___ ______ ___ ________ ___ __________ ___ _____.
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