单项选择题
As an operating system repeatedly allocates and frees storage space, many physically separated unused areas appear. This phenomenon is called ______.
A. fragmentation
B. compaction
C. swapping
D. paging
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单项选择题
（3）是（）
A.table
B.tree
C.control
D.event
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单项选择题
Sub-contractors should obey the contractor in information system project. When censoring sub-contractors, the supervisor mostly concerns about ______.
A. Amount of subcontract
B. qualifications and abilities of sub-contractors
C. responsibilities and obligations of sub-contractors
D. the contents of the subcontract
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