Generally a hard disk drive has multiple disks, known as （）.

单项选择题In （） technology, two separate and complete processing units run in parallel on a Single chip.

A.Hyper-threading
B.Caching
C.Multi-tasking
D.Dual-core

单项选择题（）allows a laptop to connect to other devices such as monitor, printer, etc.

A.Docking station
B.Switch
C.Router
D.Hub

单项选择题Which of the following components of a laptop is NOT upgradeable?（）

A. Ethernet LAN card
B. Motherboard
C. Hard disk
D. RAM

单项选择题which of the following actions will you not take before beginning installation or removal of anyNON-PNP hardware device inside the computer case?（）

A. Place all the hardware components in static proof bags.
B. Remove all the jumpers from the motherboard.
C. Switch off the main power and remove the power cord
D. Use an anti-static wrist strap.
E. Turn off the computer.
F. Place the computer on the anti-static mat

单项选择题What does ECC stand for?（）

A. Error-Checking Code
B. Extended-Checking Code
C. Error-Correction Code
D. Enhanced-Correction Code