单项选择题
Generally a hard disk drive has multiple disks, known as （）.
A.Cartridges B.Spindle motors C.Sectors D.Platters
单项选择题 In （） technology, two separate and complete processing units run in parallel on a Single chip.
单项选择题 （）allows a laptop to connect to other devices such as monitor, printer, etc.
单项选择题 Which of the following components of a laptop is NOT upgradeable?（）
