11. ( ) is a thin, flat electronic visual display that user the light modulating properties of liquid crystal(LCs). They are use in a wide range of applications including computer monitors, television, instrument panels, aircraft cockpit displays, signage, etc. ( )s have displaced cathode ray tube(CRT) displays in most applications. the are usually more compact, lightweight, portable, less expensive, more reliable, and easier on the eyes, They are available in a wider range of screen size than CRT and plasm displays, and since they do not use phosphors, they cannot suffer image burn-in

13. A ( ) is the basic unit of information in computing and telecommunucations, it is the amount of information that can be stored by a digital device or other physical system that can usually exist in only two distinct states. These may be the two stable positions of an electrical switch, two distinct voltage or current levels allowed by a circuit, two distinct levels of light intensity, two directions of magnetization or polarization, tec

15. In computing, the ( ) is the central component of most computer operating system, it is a bridge between applicasions and actual data processing done at the hardware level. The ( )'s responsibilities include managing the system's resources(the communuication between hardware andn software components). Usually as basic component of an operating system, a ( ) can provide the lowest-level abstraction layer for the resources(especially processors and I/O devices) that application software must control to perform its function. It typically makes these facilities availavle to application processes throught inter-process communucation mechanisms and system calls.