题目内容

某入侵报警探测器在12:00通电，持续运行至次日13:00故障停机，重新通电后，于13:05继续运行至18:00第二次故障停机。（1）请叙述无故障工作时间定义；（2）该设备的无故障工作时间是多少？写出具体计算步骤。

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