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
单项选择题 When replacing a laptop keyboard, the FIRST thing that Bob, a technician, should do is remove:（）
单项选择题 When applying thermal compound to the top of a CPU, apply a:（）
单项选择题 When setting security permissions on a folder, which of the following properties apply?（）
