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
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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
单项选择题
Traversing a binary tree in preorder is equivalent to
A．Traversing the forest corresponding to the binary tree in root-first order.
B．Traversing the forest corresponding to the binary tree in root-last order.
C．Traversing the forest corresponding to the binary tree in breadth-first order.
D．None of the abovE.
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