单项选择题
A. Defragment the hard drive
B. Discuss safe web-browsing habits with the customer
C. Delete temporary files, cookies and browser history
D. Install anti-virus software which uses manual updates
单项选择题 Which of the following is the default location for the User profiles folder in Windows 7?（）
单项选择题 Which of the following should the technician do FIRST when replacing a motherboard?（）
单项选择题 A technician is checking on a printer that is frequently jamming. The jams always consist ofmultiple papers becoming stuck. The paper in the printer was just reloaded this morning. Which of the following is the MOST likely reason for the jams?（）