【单选题】
当外部电源接入飞机电网时，外部电源插座附近的指示灯如何指示？___
A. NOTINUSE灯和AVAIL灯均燃亮
B. NOTINUSE熄灭和AVAIL灯燃亮
C. NOTINUSE灯和AVAIL灯均熄灭
D.
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答案
B
解析
暂无解析
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