单项选择题 An administrator is looking to apply a new service pack for an OS on several systems that run business critical applications for a large international finance corporation.  Which of the following should the administrator do FIRST？（）

单项选择题 Which of the following ensures that air is passed through a server chassis correctly?（）

单项选择题 An administrator has just upgraded a server from non-hot plug storage to all hot plug storage. Theadministrator powers up the server， during POST the RAID controller is recognized but none of the drivelights flash.  Which of the following should the administrator do FIRST to trouble shoot the problem？（）