एक सामान्य प्रकाश बल्बचे आयुष्य खूपच कमी असते कारण:
A) 1 आणि 3
B) 2 आणि 3
C) 1 आणि 2
D) 1, 2 आणि 3
योग्य उत्तर: D
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