题目内容

The data abstraction levels in a DBMS include: level, level and __ level.

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The external level defines the different __________ of the database.

There will be many levels of abstraction between the computer and the ultimate user.

A. 对
B. 错

One user program usually requires all the data in the database.

A. 对
B. 错

Different views must contain altogether different data.

A. 对
B. 错