计算机四级2022专项练习每日一练(09月09日)

1. [单选题]What is the definition of a path?

A. A sequence of vertices and the edges formed by each successive pair of vertices.
B. A walk with distinct vertices.
C. A walk with distinct edges.
D. None of the above

2. [单选题]For relation R where primary key contains multiple, no non-key attribute should be functionally dependent on a part of the primary key.This relation R is at least in

A. 1NF
B. 2NF
C. 3NF
D. BCNF

3. [单选题]某虚拟页式存储管理系统采用二级页表进行地址转换，若不考虑高速缓存和快表，则进程每执行一条指令至少需要访问几次内存？

B. 1
C. 2
D. 3

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