单项选择题

The maximum number of dara that can be expressed by 8 bis is （）.

A．64
B．128
C．255
D．256

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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

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

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