单项选择题

A technician is setting up a new inkjet printer and notices that the images appear hazy. Which of the following should the technician perform FIRST to resolve the issue?（）

A. Refill the cartridges
B. Replace the toner
C. Replace the network cable
D. Calibrate the inkjet printer

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单项选择题

Which of the following should a technician MOST likely use to test a RS-232 port?（）

A. Loopback adapter
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单项选择题

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单项选择题

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