单项选择题 A technician is replacing fifteen 21 CRTs with 19 LCDs. The storage room is on the other side of the building. Which of the following safety measures should the technician take?（）

多项选择题 Which of the following hardware is hot pluggable?（）

单项选择题 A technician needs to assign a default subnet mask for a class B network to a network device that was just installed. Which of the following would the technician use?（）