With series ventilation underground, production activities in many places were running under little or even no airflow. Motor tricycles without explosive-proof quality were used underground.
井下串联通风、多处无风微风作业，使用非防爆机动三轮车。
With series ventilation underground, production activities in many places were running under little or even no airflow. Motor tricycles without explosive-proof quality were used underground.
井下串联通风、多处无风微风作业，使用非防爆机动三轮车。
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