The dual control mode is one of the three new mechanical ventilation modes.

双重控制模式是机械通气的三大新模式之一。

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Describes the composition and running modes of the smoke control and exhaust system, including the fire ventilation system at stations and in the tunnel, and the fire alarm and device control system.

简述了地下铁道防排烟系统的组成及其运行方式，包括车站及区间隧道火灾事故通风系统，火灾报警与设备监控系统。

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