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单选题
AC 1 AND AC 2 BUSES ARE SUPPLIED BY THEIR OWN SIDE GENERATOR， THEN:
A
By the external power， then by the APU generator and then by theopposite generator.
B
By the APU generator， then by the external power and then bythe opposite generator.
C
By the opposite generator only.
答案解析
正确答案：A
解析：
题目解析
答案：A
解析：AC 1和AC 2母线分别由它们自己一侧的发电机供电。当使用外部电源时，母线首先由外部电源供电，然后由APU发电机供电，最后由对侧的发电机供电。选项A正确地描述了这一过程。
