单项选择题
A. Replace the printer ribbon.
B. Replace the pickup assembly.
C. Replace the fuser.
D. Replace the print head.
单项选择题 A user reports that the laser printer is constantly jamming on humid days. Which of the following is the MOST likely resolution to the problem?（）
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?（）