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单选题

When there is an "emergency" situation, it is usually a failure that requires an immediate and quick response, such as an entire engine failure, fire or smoke, or perhaps a rapid drop in cabin pressure.

A For "emergency", the related failure should be responded immediately, for example, the total engine failure,fire or smoke sudden cabin pressure lost.

B An "Emergency"almost including a serious failure that requires later response, such as a total engines failure, flame out or smoke or rapid cabin pressurization.

C For "emergency ", the related failure should be treated immediately, for example, the total engine is not malfunctioning , fire or smoke sudden cabin pressure lost.

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正确答案：A （备注：此答案有误）

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