Push-pull air flow is a kind of economical and effective ventilation flow.
吹吸气流是一种经济和有效的通风气流组织形式。
The calculation models are set up on average speed and Max speed in back field and jet effect distance, new theoretical reference is provided for effective ventilation in heading fa.
给出了回流区平均速度、最大回流速度及射流作用距离的计算模型，为掘进工作面合理有效通风提供了新的理论依据。
Make sure you have effective ventilation throughout your home.
确保家庭有效通风。
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