单项选择题

A networking device that sends packets to all connections is a:（）

A. gateway.
B. hub.
C. switch.
D. router.

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单项选择题

A technician is servicing a customer’s color laser printer and notices excess toner in the printer.Which of the following tools would BEST assist the technician in removing the excess toner?（）

A. Damp towel
B. Compressed air
C. Alcohol wipe
D. Computer vacuum

单项选择题

Which of the following would BEST provide cooling to a processor?（）

A. Case fan
B. Heatsink
C. Liquid cooling system
D. CPU fan

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