题目内容

For relation R where primary key contains multiple attributes,no non-key attribute should

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

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The dung beetles cause an immediate improvement to the quality of a cow pasture.

A. YES
B. NO
C. NOT GIVEN

Dung beetles were brought to Australia by the CSIRO over a fourteen-year period.

A. YES
B. NO
C. NOT GIVEN

TCP service is obtained by having both the sender and the receiver create end points,which

A. network address
B. supernet address
C. socket
D. IP address

一般认为，对编程语言的性能要求有：
Ⅰ.一致性
Ⅱ.无二义性
Ⅲ.简洁性
Ⅳ.局部性
Ⅴ.线性
但当逻辑操作中出现很多分支或多个循环时，则违反了要

A. Ⅰ和Ⅱ
B. Ⅱ和Ⅲ
C. Ⅲ和Ⅳ
D. Ⅴ