题目内容

Although her research topic had been approved by her thesis advisor, the library persisted in ______ the documents.

A. its denial for access
B. deny her access to
C. denying her access to
D. denying her access for

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设有文法： W→AO A→A0|W1|0 将它改写后消除左递归后的文法是（）。

A. W→A0
A→0A'
A'→0A'|01A'|ε
B. W→A0
A→A0 |A01| 0
C. W→A0
A→0A'
A→0A'|01A'
D. 以上均不对

An important customer may resent being ______ by an assistant rather than by the boss.

A. condescended to
B. devoted to
C. attended to
D. conformed to

She ______ because she found the journal interesting.

A. subscribed
B. prescribed
C. described
D. inscribed

2NF通过（）就规范为3NF。

A. 消除非主属性对码的部分依赖
B. 消除非主属性对码的传递依赖
C. 消除主属性对码的部分和传递依赖
D. 消除非平凡且非函数依赖的多值依赖