单项选择题

A stack protocol can be used for (69) .

A．job scheduler in Operation System
B．operation of arithmetic expressions
C．removing the latest element inserted
D．removing the earliest element inserted

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单项选择题

(74) isn't a type of transmission medium used for LANs.

A．Twisted pair
B．Coaxial cable
C．Satellite
D．Optical fiber

单项选择题

In the RGB color spaces, each pixel on the screen has a corresponding RGB value which consists of (71) components.

A．two
B．three
C．four
D．six