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The ventilation system uses differentia pressure to pull air out of the airplane.

A通风系统使飞机产生不同的压力从而将废气排出。

B飞机利用通风系统将空气排出机外。

C通风系统利用压差将空气排出飞机。

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正确答案：A （备注：此答案有误）

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