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单选题
(L FIRE FAIL) 左发火警失效警戒信息指示：L FIRE FAIL Caution message indicates:
A
探测到火警后，灭火系统已失效。After a detected fire, the extinguishing system has failed.
B
指示发动机火警探测环路失效（A或B）。Indicates an engine fire detector loop failure (A or B).
C
指示左发探测系统失效。Indicates a failure of the LH engine detection system.
D
两个灭火瓶已释放但火警仍可通过一个火警探测环路探测。Both fire extinguisher bottles are discharged but a fire is still detected by the one of the fire detector loops.
答案解析
正确答案：C
