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

正确答案 ：B

A walk with distinct vertices.

[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

正确答案 ：B

2NF

[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？

正确答案 ：D

3

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