Compound ventilation mode is adopted in this system, so that natural draught and mechanical ventilation can alternately function under different conditions.

采用混合式通风方式，自然通风和机械通风可以依据不同的条件交替运行。

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Compound ventilation mode is adopted in this system, so that natural draught and mechanical ventilation can alternately function under different conditions.

采用混合式通风方式，自然通风和机械通风可以依据不同的条件交替运行。

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