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单选题
空中，如果探测到APU火警，海伦灭火瓶会自动放出。In flight, if a fire is detected in the APU, the halon bottle will automatically discharge.
A
仅如果两个探测环路＇A＇ 和＇B＇都探测到火警。Only if the fire is detected by both detectors loops ＇A＇ and ＇B＇
B
仅当飞机高度高于31,600 ft 时。Only when the aircraft altitude is above 31,600 ft.
C
空中，没有自动释放。In flight, there is not automatic discharge
D
正确。Yes
答案解析
正确答案：C
