数据库的三级结构模式是指(20)、外模式和内模式。
-
(81)
- A．bits
- B．bytes
- C．cycles
- D．words
-
The main function of a processor is to(68)and carry out instructions which usually consist of operation and(69). The term to measure the speed of the processor is called a Megahertz(MHz), which means million(70)per second.
- A．translate
- B．interpret
- C．describe
- D．store
-
(80)
- A．operand
- B．data
- C．object
- D．member
-
(78)
- A．interpret
- B．open
- C．decrypt
- D．encrypt
-
The successful spread of a virus depends on how long it can()unnoticed, before its presence is made known by the activation of side-effects.
- A．move
- B．replicate
- C．backup
- D．die out
-
(76)
- A．display screen
- B．printer
- C．keyboard
- D．card reader
-
Anti- virus software protects your computer from viruses by(75)your computer's memory and disk devices.
- A．deleting
- B．changing
- C．scanning
- D．replacing
-
(70)is not a peripheral component or device. The basic input device on a small computer is a(71).
- A．Digital Camera
- B．Printer
- C．Mouse
- D．Driver
-
A(74)is a device that enables the computer to handle sounds.
- A．network card
- B．video card
- C．sound card
- D．monitor
-
The transmission media used t0 build a LAN is(73).
- A．twisted pair
- B．microwave
- C．optieal fiber
- D．satellitic signal
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