单项选择题

In a computer, which of the following is the longest period？

A．Beat period
B．Machine period
C．Instruction period
D．CPU period
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单项选择题
符合IEEE802.3标准的Ethernet网物理地址采用连续编码方法，它使用的地址长度为
A．8bit
B．16bit
C．48bit
D．64bit
单项选择题
Which of the following statements describe(s) the properties of a purely segmented memory systemⅠ．It divides memory into units of equal sizeⅡ．It permits implementation of virtual memoryⅢ．It suffers from internal fragmentation
A．Ⅰ only
B．Ⅱ only
C．Ⅲ only
D．Ⅰand Ⅲ
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