单项选择题

In the WAN，when a point-to-point subnet is used，an important design issue is the roucer interconnection （）

A．topology
B．computer
C．service
D．lines

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单项选择题
（） is a sequence of letters and digits,the first character mustbe a letter.

A．An identifier
B．A string
C．An array
D．program
单项选择题
Which of the following statements describe(s)the properties of a purely segmented memory system? （） Ⅰ．It suffers from internal fragmentation Ⅱ．It permits implementation of virtual memory Ⅲ．It divides memory into units of equal size

A．Ⅰ only
B．Ⅲ only
C．Ⅱ only
D．Ⅰand Ⅲ
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