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【简答题】硫酸生产的原料主要有( )、( )、( )等,我国硫资源主要是( ),而世界制硫酸的原料主要是( )。
【单选题】若关系模式R（U，F）属于3NF，则（ ）。
A.
一定属于BCNF
B.
消除了插入异常和删除异常
C.
仍可能存在一定的插入异常和删除异常
D.
属于BCNF且消除了插入和删除异常
【单选题】Language can refer to things that are not present in the immediate situation of the speaker. For example, if someone says I was afraid, it is not necessary that the speaker is still afraid. Which of t...
A.
Arbitrariness.
B.
Motivation
C.
Interchangeability.
D.
Displacement.
【简答题】生产硫酸的主要原料有哪些？我国生产硫酸的主要原料是什么？
【单选题】若关系模式R(U,F)属于3NF,则( )
A.
R一定属于BCNF
B.
消除了插入、删除异常
C.
仍存在一定的插入和删除异常
D.
属于BCNF且消除了插入和删除异常
【单选题】Which of the following statements is NOT TRUE according to the passage?______.
A.
The speaker has been deeply impressed by the great change in China.
B.
The speaker has little confidence in the future of Sino-American relations.
C.
There are still many problems to be solved concerning Sino-American relations.
D.
There are more and more non-governmental contacts between the two nations.
【单选题】It can be inferred from the passage that Ahmed was______.
A.
a fast speaker
B.
a boring speaker
C.
a laconic speaker
D.
an interesting speaker
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