To guide the design and operation of emergency ventilation system, intensive study on several key issues of emergency ventilation theory has conducted.
为了指导应急通风系统的设计与运行，本文针对应急通风理论中的若干关键问题进行了较为深入的研究。
It has many advantages including wide application, simple operation, decreased injury and stimulation to respiratory tract, less complication and reliable ventilation efficacy.
具有应用范围广，操作简便，对呼吸道的损伤、刺激小，并发症少，能维持有效、可靠的通气。
The energy saving technology of metal mine ventilation is analyzed and discussed so as to increase operation efficiency of energy saving in ventilation.
对金属矿山通风节能技术进行了分析与探讨，以提高其节能运行效率。
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