单选题Which of the following should the technician do FIRST when removing a paper jam?（）AOpen all the doors in the printer.BClear the print queue.CTurn the printer off.DTake the printer offline.
单选题
Which of the following should the technician do FIRST when removing a paper jam?（）
A
Open all the doors in the printer.
B
Clear the print queue.
C
Turn the printer off.
D
Take the printer offline.
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