Which of the following storage devices is not an example of an optical storage device?（）

单项选择题（）are often used to organize and index the information or prices of objects.

A. Object codes
B. Bar codes
C. References
D. Notes

单项选择题POST errors in the 17xx range generally indicate （）errors.

A.USB
B.Floppy disk drive
C.Motherboard
D.Hard disk drive
E.COM1

单项选择题Bluetooth is a （）technology.

A. Satellite
B. Microwave
C. Light wave
D. Radio Frequency