removing shaft
排风坚井 blowing-out shaft
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本文又在负压区运用了正压井、负压井、动态气流密封负压高效排风装置等一系列有价值的措施，并在理论上证实其实用意义。
Some measures such as the positive pressure well, the negative pressure well, the high efficiency exhaust sealed with dynamic air current are all effective in theory.
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