单项选择题
A. Space reserved by the drive manufacturer for firmware.
B. Space set aside by Windows for use by the virtual memory swap file.
C. A potentially dangerous virus has been downloaded onto the system.
D. A recovery partition put there by the manufacturer.
多项选择题 Which of the following commands verifies connectivity between two hosts?（）
单项选择题 A customer reports that the laser printer produces poor quality printouts. Having arrived onsite, the technician has a discussion with the customer and reviews some examples of their print jobs. Which of the following should the technician do NEXT? （）
单项选择题 A technician receives a boot error message OS not found. Which of the following should thetechnician check? （）