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单选题

When this occurs, 9th stage bleed air is automatically used.

A当这种情况发生时,你可以选择使用第9级引气。

B当这种情况发生时,将自动使用第9级引气。

C当这种情况发生时,人工打开第9级引气。

正确答案:A (备注:此答案有误)

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