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随便看	ventilation piping ventilation plan ventilation planning ventilation passage ventilation passage of metro ventilation passages ventilation pattern ventilation penetration ventilation performance ventilation perfusion Ventilation-Perfusion ventilation/perfusion ventilation perfusion imaging ventilation-perfusion imbalance ventilation perfusion lung scanning ventilation-perfusion lung scanning ventilation perfusion mismatching ventilation/perfusion mismatching ventilation / perfusion mismatching ventilation perfusionquotientof lung scan ventilation perfusionquotient of lung scan ventilation-perfusionquotientratio ventilation-perfusionquotient ratio ventilation-perfusion quotient ratio ventilation perfusion ratio