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【多选题】
“ 四柱结算法 ” 创建于我国的( )。A.
唐朝
B.
宋朝
C.
明朝
D.
清朝
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反馈参考答案：
举一反三
【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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