单项选择题

The information can be written into both the block in the Cache and the block in the memory. This kind of technique used in the Cache is called（）

A．write through
B．copy back
C．write buffer
D．copy through

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单项选择题

The data hazard in pipeline does not include（）.

A．RAW
B．WAW
C．WAR
D．RAR

单项选择题

Let the schema R(U, F), U=ABCD, F={A→BC, C→D }. The schema R(U, F) is in the normal form of（）.

A．1NF
B．2NF
C．3NF
D．BCNF

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