单项选择题

The　smallest　unit　of　information　in　a　computer　system　is　called　a(72)

A．Bit
B．Byte
C．block
D．file
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单项选择题
Which one of the following expressions is equivalent to ’X BETWEEN 15 AND 25’(25).
A．X＞15 AND X＜25
B．X=15 AND X=25
C．X＞25 AND X＜15
D．X＞=15 AND X＜=25
单项选择题
The methods used in Asynchronous Transfer Mode (ATM)are switch technology and(17)is used to describe this mode.
A．cell exchange
B．message exchange
C．information exchange
D．packet exchange
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