多项选择题
Which of the following are supported bus widths for a PCIe bus slot?（）
A. 1x
B. 3x
C. 6x
D. 16x
E. 24x
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单项选择题
A user states that they are trying to project their laptop to a screen for a presentation. They have plugged the projector cable into their laptop, and turned the projector on, but no signal is found. Which of the following should the technician perform FIRST?（）
A. Ensure the projector is receiving power
B. Verify the laptop is not running on battery
C. Toggle the function key for displays
D. Replace the projector cable with another -
单项选择题
A user states that whenever they try to launch a certain installed application, they hear unusual whirring/clicking sounds from their machine and the application never loads. Which of the following components would a technician MOST likely need to replace?（）
A. Hard Disk Drive
B. Optical Drive
C. Power Supply Unit
D. Case Fan -
单项选择题
Which of the following security threats are MOST likely prevented through user training?（）
A. Network Intrusion
B. Adware Popups
C. Social Engineering
D. Spam Messages
