单项选择题

In a certain cache system, the modified cache block is written to main memory only when the block is replaced. All of following are used to describe this policy EXCEPT

A． store-in
B． write-back
C． copy-back
D． write-through
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单项选择题
Local bus can reduce the occupation time of CPU. For the EISA local bus, commonly the time can be reduced to
A．0.42
B．0.22
C．0.12
D．0.02
单项选择题
Which of the following is not among the basic features of a relational database
A． It does not matter what order the rows are in.
B． It does not matter what order the columns are in.
C． Different columns should have different column names.
D． Different columns should have different data types.
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