单选题

The surge tank drain check valve also prevents fuel flow from main tank 1 and main tank 2 to the surge tank.

A通气油箱排放单向活门也防止燃油从1号和2 号主油箱流到通气油箱。

B通气油箱排放检点活门也帮助1号和2 号主油箱燃油流到通气油箱。

C通气油箱排放单向活门也允许燃油从1号和2 号主油箱流到通气油箱。

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正确答案：A （备注：此答案有误）

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