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单选题
B-737 CL 飞机外部电源插座中包括2根较短的插钉，它们的作用是：
A
提供外部电源已连接信号
B
提供外部电源已使用信号
C
是两个短接钉，用来连接DC控制联锁，当供电的期间外部电源被意外移开，系统可以防止P19板产生电弧。
D
没有实际作用
答案解析
正确答案：C
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