单项选择题
A. 50-pin SCSI B. 40-pin ribbon C. 34-pin ribbon D. 4-pin SATA
Which of the following ports is the default for HTTP?（）...
单项选择题Which of the following ports is the default for HTTP?（）
A.21 B.25 C.80 D.110
Which of the following keys is pressed to enter the Win...
单项选择题Which of the following keys is pressed to enter the Windows boot options after POST?（）
A.F1 B.F8 C.F10 D.F12
A networking device that sends packets to all connectio...
单项选择题A networking device that sends packets to all connections is a:（）
A. gateway. B. hub. C. switch. D. router.
