单项选择题
（）is commonly performed on CPUs and video cards to allow users to get enhanced performance.
A. Hyperthreading B. Duplexing C. Caching D. Overclocking
单项选择题 Which of the following storage devices is not an example of an optical storage device?（）
判断题 "POST errors in the 600-699 range generally indicate Floppy disk drive errors.
单项选择题 （）are often used to organize and index the information or prices of objects.
