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单选题
将M238电源信号灯模块上的S2电门设置到“TEST”位置，其作用是：
A
对电源系统进行自检
B
对灯光系统进行自检查
C
验证M238模块上的指示灯灯泡可用
D
验证指示灯对应的电源系统供电正常
答案解析
正确答案：C
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