单项选择题
A. Replace the paper with thinner paper.
B. Replace the toner cartridges.
C. Replace the fuser.
D. Replace the print heads.
单项选择题 When setting up a new small office home office (SOHO) wireless network, which of the following is MOST likely to be the default wireless channel?（）
单项选择题 A user would like to ensure that only their family and their laptops can access a newly installed wireless router. Which of the following BEST accomplishes this?（）
单项选择题 Which of the following wireless networking standards can operate at two different frequenciessimultaneously?（）