单项选择题
A. The power supply has failed.
B. The drive cable is connected backwards.
C. The floppy drive has failed.
D. The proper drivers have not been loaded.
单项选择题 A mirrored set is another name for which of the following?（）
单项选择题 A laser printer keeps printing out crumpled pages from the third tray. Which of the following is the MOST likely explanation?（）
单项选择题 A user is attempting to access a website but is getting a ‘Page cannot be displayed’ error. The technician checks the IP address of the computer and sees that it has been assigned 169.254.10.70. Which of the following is the MOST likely cause?（）