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多选题
A user reports that a printer has started producing a repetitive image defect on all printouts. Which of the following are the MOST likely causes of the problem?（） (Select TWO).
A
Toner cartridge
B
Laser scanner
C
Formatter PCB
D
Pickup rollers
E
Fuser
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单选题A technician is troubleshooting a user’s problem; important Windows services are not starting. In which of the following locations should the technician check to investigate when these services started or stopped?（）A
Com+.logB
System LogC
Security LogD
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