单项选择题
Which of the following is MOST likely a managed, Layer 3 device?（）
A.Router
B.Bridge
C.Hub
D.Switch
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A user is experiencing headaches and motion sickness symptoms when using their new computermonitor. Which of the following can a technician adjust to help the user?（）
A. Privacy filter
B. Refresh rate
C. Use a digital signal
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单项选择题
A technician is installing a new power supply into a computer. One of the power supply connectors that the technician needs to connect to the motherboard is square and contains 4-pins. This connector is known as which of the following?（）
A.SATA
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单项选择题
A technician installs a CD-RW drive with a feature that enables the drive to write labels directly onto the disk. The computer will burn disks but will not write labels. Which of the following should the technician do NEXT?（）
A. Reboot the computer
B. Remove the drive and reinstall
C. Install the device driver
D. Flash the BIOS
