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单选题 A shipping department is reporting that a laser printer in the receiving area is becoming jammed because the printer attempts to pull several sheets of paper for each print.Which of the following may be the cause?()

A

The paper is sticking to the corona wire and causing the jam.

B

Humidity is causing the paper to stick together.

C

A4 paper is being used and may not be supported by laser printers.

D

The fusion roller is dirty and pulling too many sheets of paper.

单选题 To force a user to use Ctrl-Alt-Delete to log into the computer, a technician can go to Control Panel then:()

A

Accessibility options.

B

Security Center.

C

User accounts and the Advanced tab.

D

Windows Firewall.

单选题 A new computer is displaying the wrong amount of memory. Which of the following may be the cause?()

A

The module is installed backwards.

B

A USB device is using some memory.

C

An onboard video card is using some memory.

D

The CPU is using some memory.

单选题 A technician receives a computer for repair and observes that the fan on the power supply is not moving. Which of the following should the technician do? ()

A

Move the power supply voltage switch to 220 volts.

B

Add an additional fan to help cool the computer.

C

Replace the cable that attaches the power supply to the motherboard.

D

Replace the power supply.

单选题 Which of the following is used to produce the best LCD image on a laptop?()

A

Dual scan

B

Active matrix

C

Passive matrix

D

Active scanning

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