【单选题】【消耗次数：1】
定点救治医院所有病房窗户应可开启，不具备自然通风条件要选择机械通风或空气消毒措施，合理配置新风系统、回风系统和排风系统，建立（ ）的气流组织形式，每小时气流循环次数至少6次
①
下送风上回风
②
上送风下回风
③
上送风上回风
④
下送风下回风
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