单项选择题
A technician suspects the AC voltage into a PC power supply is bad. Which of the following toolswould MOST likely be used to confirm the diagnosis?（）
A. Multimeter
B. Oscilloscope
C. Cable tester
D. Power supply tester
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Which of the following does an out-of-memory error indicate on a printer?（）
A. A faulty memory module in the printer.
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A. Open all the doors in the printer.
B. Clear the print queue.
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