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单选题
Which of the following factors is the MOST likely cause of a power supply fan failure？（）
A
Extreme temperature variances
B
Extreme humidity variances
C
Power stability fluctuations
D
Excessive dust accumulation
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单选题Which of the following factors is the MOST likely cause of a power supply fan failure?（）A
Extreme temperature variancesB
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Move the power supply voltage switch to 220 volts.B
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