单项选择题
Which of the following should be avoided when installing a laser printer?（）
A. Surge protector B. UPS C. RJ-45 connector D. Toner
单项选择题 Which of the following is the subnet mask for a Class C IP address?（）
单项选择题 Which of the following is the IPv6 loopback address?（）
单项选择题 Which of the following computers are used for basic applications and meets the MINIMUMrequirements for running Windows?（）
