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单选题
A computer’s case fan protects against which of the following environmental concerns?（）
A
Pressure
B
Heat
C
Brown out
D
Cold
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单选题A computer’s case fan protects against which of the following environmental concerns?（）A
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单选题Which of the following is a reason why Bob, a technician, should install case fans in the front of acomputer case?（）A
It forces hot air out of the PCB
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It forces cooler air into the power supply quicklyD
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The CPU needs to be reseated.
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