单项选择题
A. The print queue window from system tray
B. Properties of the printer from the Printers Control Panel
C. Print spooler view in the Printers Control Panel
D. Properties of the port within Device Manager
单项选择题 Which of the following protocols uses port 80?（）
单项选择题 While performing a preventative maintenance check on a personal computer, a technician notices thatseveralunused expansion card slots have open ports. Which of the following BEST describes why the covers for these card slots should be reinstalled?（）
多项选择题 Which of the following are valid ports for printing over a network? （）