单项选择题 A user states that the laser printer is leaving a black line on all pages being printed. Which of thefollowing is the MOST likely cause and solution for this issue?（）

单项选择题 Which of the following CPUs would fit into an AM2 socket?（）

单项选择题 After receiving a message at startup stating that ‘One or more services failed to load at startup’,which of the following Windows utilities would a technician use to diagnose the issue?（）