单项选择题 A technician is troubleshooting a WLAN card in a laptop. The wireless infrastructure is 802.11g. The WLAN card is showing connected at 11Mbps. Which of the following would be the BEST reason why the WLAN card is performing at that speed?（）

单项选择题 A technician is upgrading an internal IDE drive in a laptop. Which of the following HDD types is thetechnician MOST likely using?（）

单项选择题 A system powers on, begins POST, displays the BIOS version information and then hangs with the error message ‘Error loading operating system’. Which of the following is MOST likely the cause of this issue? （）