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单选题
什么时候飞行员会选择将电子设备（电子风扇）选到STBY？When is the STBY fan for Electronic Equipment (AVIONICS FAN) selected by the pilot?
A
当出现过热情况时作为额外空气源 As an extra source of air in overheat conditions
B
万一失去GND和FLT风扇。In the event of loss of GND and FLT fans
C
万一失去GND风扇。In the event of loss of GND fan
D
飞行员不能选择STBY风扇。The STBY fan cannot be selected by the pilot
答案解析
正确答案：B
