单项选择题 Which of the following is unsafe for a technician to use when troubleshooting or repairing a CRT monitor?（）

单项选择题 Which of the following tools would be BEST to use to pry open the case of a laptop?（）

单项选择题 A user states that when the user copies files from ‘My Documents’ to a network share, the files are no longer available locally. Which of the following BEST describes the reason the files are no longer visible?（）