单项选择题 A technician is attempting to determine whether a CAT5 patch cord is a straight-through or acrossover. Which of the following is the BEST to use to determine the cord type?（）

单项选择题 A workstation has an error message that states “NTLDR is missing”. Which of the following is MOST likely the cause?（）

单项选择题 A technician is replacing a processor in a workstation. After installation, the workstation starts up and immediately shuts down; the technician tries to start the workstation several more times and gets the same result. Which of the following is the cause of this issue?（）