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1. ¡®the actual air pressure and maximum air pressure of the main fans¡¯ ¨C incorrect mine ventilation terminology.£¨ÕâÀïÎÒÒª±íÊöµÄÖÐÎÄÒâ˼ÊÇ¡°¿ó¾®Ö÷·ç»úµÄʵ¼Ê¹¤×÷·çѹÓë×î¸ß·çѹ¡±£©
2. 'natural air pressure' - incorrect mine ventilation terminology.£¨ÕâÀïÎÒÒª±íÊöµÄÖÐÎÄÒâ˼ÊÇ¡°×ÔÈ»·çѹ¡±£©
3. What are ventilation structures?£¨ÕâÀïÎÒÒª±íÊöµÄÊÇ¡°Í¨·ç¹¹ÖþÎ£©
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