A. Case fanB. Thermal compoundC. Motherboard riserD. Po……

单项选择题Which of the following printers requires a specialized paper in order to operate?（）

A.Thermal
B.Laser
C.Inkjet
D.Impact

单项选择题Which of the following is the correct connector for an internal floppy drive?（）

A. 50-pin SCSI
B. 40-pin ribbon
C. 34-pin ribbon
D. 4-pin SATA

单项选择题Which of the following ports is the default for HTTP?（）

A.21
B.25
C.80
D.110

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

单项选择题A networking device that sends packets to all connections is a:（）

A. gateway.
B. hub.
C. switch.
D. router.