单项选择题
A. The wireless card needs to be replaced.
B. The antenna wires are not connected properly.
C. The wireless drivers need to be updated.
D. The display panel is defective.
单项选择题 Mike, a technician, is troubleshooting a printer issue. The print spooler for a local printer continues to fill up with new jobs and no jobs are being processed at the printer. Which of the following is MOST likely the cause?（）
单项选择题 Which of the following commands scans and verifies system protected files?（）
单项选择题 Which of the following tools should Mike, a technician, use when testing a serial port?（）