某文件管理系统在磁盘上建立了位示图（bitmap），记录磁盘的使用情况。若磁盘上物理块的编号依次为：0、1、2、....；系统中的字长为32位，位示图中字的编号依次为：0、1、2、..，每个字中的一个二进制位对应文件存储器上的一个物理块，取值0和1分别表示物理块是空闲或占用。假设操作系统将2053号物理块分配给某文件，那么该物理块的使用情况在位示图中编号为（ ）的字中描述。
- A.32
- B.33
- C.64
- D.65
正确答案及解析
正确答案
解析
2053号物理块是第2054块物理块，每一个字可以表示32个物理块的存储情况，2054/32=64.xxx，因此，此时应该排在第65个字，从0号开始编号，则为第64号字。
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