单项选择题

Every valid character in a computer that uses even （） must always have an even number of 1 bits.

A．parity
B．check
C．test
D．compare

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单项选择题

（）：A graphical bar with buttons that perform some of the most common commands.

A．Titlebar
B．Tool bar
C．Statusbar
D．Scroll bar

单项选择题

（）：A collection of related information，organized for easy retrieval.

A．Data
B．Database
C．Buffer
D．Stack

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