The existing problem in conventional design method for ventilation system in hotel kitchen resulted in high ventilation ratio and large heat energy consumption.
酒店旧厨房空调换气系统的设计方法存在问题，而导致换气次数高、热能消耗过大。
Because of the large expansion ratio of liquid to gas, it is very important to provide adequate ventilation in areas using liquid nitrogen.
因为液体到气体的大膨胀率，为正在使用液氧的地方提供充分的通风非常重要。
Because of the large expansion ratio of liquid to gas with cryogenic liquids, it is very important to provide adequate ventilation where cryogenic liquids are stored and used.
因为液体到气体的大膨胀率，为正在使用液氧的地方提供充分的通风非常重要。
The both methods enjoy advantages of higher production capacity, lower development ratio, less dilution loss and better ventilation.
两种方法均具有生产能力高，采掘比低，贫化损失较小，改善通风条件等优点。
Objective to observe the effect of inverse ratio ventilation (IRV) on hemodynamics and oxygen metabolism in sheep with acute respiratory distress syndrome (ARDS).
目的探讨反比通气(IRV)对急性呼吸窘迫综合征(ARDS)绵羊血流动力学及氧代谢的影响。
Objective: To investigate the constituent ratio and change of bacterial strains in patients with severe pulmonary infection before and after mechanical ventilation.
目的：探讨机械通气前后不同类型严重肺感染和抗生素应用时相应各时段的致病细菌构成与转换，为临床治疗提供有效依据。
The simulated result showed a optimum ratio of chimney length and width which is about 12:1 under the working condition of ventilation;
通风工况下的模拟结果显示烟囱风道通风的最佳长宽比为12：1；
On the basis of analyses and researches, this paper derives a method to measure the air leakage ratio within the last 100m ventilation pipe and the air volume to be provided by the ventilation fans.
并通过分析研究，推导出末段百米漏风率的测定方法，及其计算漏风量和风机供风量的公式。
On the basis of analyses and researches, this paper derives a method to measure the air leakage ratio within the last 100m ventilation pipe and the air volume to be provided by the ventilation fans.
并通过分析研究，推导出末段百米漏风率的测定方法，及其计算漏风量和风机供风量的公式。
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