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.
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?（）
单项选择题 Which of the following commands will make a new directory?（）
