单项选择题

Which of the following commands shows a graphical display of the drive or paths directorystructure?（）

A. dir
B. call
C. tree
D. path

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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.
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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.
B. All sub-folders inherit the most restrictive permissions within the folder.
C. All sub-folders within that folder are given a password.
D. By default, read permissions are denied on all files within the folder.