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单选题
which of the following actions will you not take before beginning installation or removal of anyNON-PNP hardware device inside the computer case?（）
A
Place all the hardware components in static proof bags.
B
Remove all the jumpers from the motherboard.
C
Switch off the main power and remove the power cord
D
Use an anti-static wrist strap.
E
Turn off the computer.
F
Place the computer on the anti-static mat
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