题目内容

Digital computer uses ( ) number system.

A. binary
B. decimal
C. octal
D. hexadecimal

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( (____)) is the heart of a computer system.

A. Memory
B. Hard disk
CPU
D. Keyboard

Some keys on keyboard have two characters. When we want to get the upper character we should hold () and press the key.

A. Ctrl
B. Shift
C. Alt
D. any of the above

One KB equals () bytes.

A. 512
B. 1024
C. 1000
D. 2048

When we want to open an item, we can point to the item, and ( ) the mouse.

A. right-click
B. click
C. double-click
D. drag