单项选择题
When replacing a laptop keyboard, the FIRST thing that Bob, a technician, should do is remove:（）
A. the battery.
B. the memory cover and memory sticks giving access to the screws holding the keyboard in place.
C. the top bezel covering the screws holding the keyboard in place.
D. the AC power.
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When applying thermal compound to the top of a CPU, apply a:（）
A. thick layer, making sure to cover the sides of the CPU.
B. very thin layer, making sure to cover the CPU.
C. little bit on the tip of a brush, making sure to cover the top and sides of the CPU.
D. small amount in the center of the CPU. -
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When setting security permissions on a folder, which of the following properties apply?（）
A. Guest users are allowed changed permissions.
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A.cd
B.md
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