问题
单项选择题
Which of the following statements describe(s) the properties of a purely segmented memory system Ⅰ．It divides memory into units of equal size Ⅱ．It permits implementation of virtual memory Ⅲ．It suffers from internal fragmentation
A． Ⅰ only
B． Ⅱ only
C． Ⅲ only
D． Ⅰand Ⅲ
答案
参考答案：B