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【单选题】
在检查以下电路中灯泡不亮原因而测量个接头电压时,哪些诊断结论是正确的。( )
A.
故障在接头A，接头接触不良；
B.
故障在接头B，接头短路；
C.
故障在接头C，接头断路；
D.
故障在接头C，接头短路；
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