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单项选择题

A medical customer has a rack with four BladeCenter H chassis that have been operating normally for several months. After installing a new rack of servers in the data center, the system administrator notices the blowers in the BladeCenters have increased their speed. Which of the following caused this problem? ()

A.The room temperature has reached 23C (73.4F). 
B.A Blade within the chassis has been shut down. 
C.The ambient temperature in the data center has increased 
D.One of the additional System X servers in the BladeCenter rack has failed.

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