The analysis provides guidance and direction for application, of controlled circulating ventilation in underground mines, especially those old mines.
为可控循环通风的应用，特别是对衰老矿井解决矿井通风问题提供了清晰的思路和方向。
The analysis provides guidance and direction for application, of controlled circulating ventilation in underground mines, especially those old mines.
为可控循环通风的应用，特别是对衰老矿井解决矿井通风问题提供了清晰的思路和方向。
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