多选题
A FREE_SPACE indicates only the space that is currently unallocated.
B ALLOCATED_SPACE indicates only the space currently allocated and in use.
C FREE_SPACE indicates only the space that is currently allocated and available for reuse.
D ALLOCATED_SPACE indicates both the space currently allocated and used，and the space that is available for reuse.
E FREE_SPACE indicates both the space that is currently allocated and available for reuse，and the space that is currently unallocated.
正确答案
答案解析
略
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