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单选题
当工作人员将外部电源电缆连接到飞机外部电源插座之前，必须确认电缆未被施加电压，其作用是：
A
防止飞机被意外接通电源
B
防止电缆带电伤人
C
防止在连接的时候产生电弧，造成设备和人员的损伤
D
外电源电缆可带电连接，也可不带电连接，因为飞机外电源系统中包含有保护电路
答案解析
正确答案：C
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