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单选题
当双汇流条断电时，在飞行高度25000英尺以上，不建议试图启动APU,而高度在25000英尺以下，建议最多只启动一次。
A
APU start attempts are inhibited above 25,000 feet with both busses off, only one start attempt is allowed below 25000 feet.
B
With both busses power off, APU start attempts is recommended above 25000 feet and only one start could be accepted below 25,000 feet.
C
APU start attempts are not
recommended above 25,000 feet.
With both busses off, only one start
attempt is recommended below 25,000 feet.
答案解析
正确答案：C
相关知识点：
双汇流条断电APU启动记
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