单选题

If an engine fire detection system is available. describe, give principle of operation, and explain how to use it.

A如果发动机灭火系统可以使用，描述，给出操作原则，并说明如何使用。

B如果有发动机火警探则系统，描述

C如果发动机火警探测系统正常工作，描述，给出操作方法，并说明如何使用。

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正确答案：A （备注：此答案有误）

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