单项选择题
An administrator has a rack server that is 5.25 inches （13.3 cm） tall， which of the following is the correct U size for this server？（）
A. One B. Three C. Four D. Five
单项选择题 Which of the following BEST describes the difference between RAID 5 and RAID 6?（）
单项选择题 Which of the following BEST describes RAID 5?（）
单项选择题 When adding another server to an existing rack mount system, which of the following should the administrator consider FIRST?（）
