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【单选题】
四氢硼钠反应用于鉴别A.
黄酮、黄酮醇
B.
异黄酮
C.
酮
D.
二氢黄酮、二氢黄酮醇
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举一反三
【单选题】All the following languages can be used for relational databases, EXCEPT
A.
T-SQL.
B.
SQL.
C.
SQL-92.
D.
BASI
【单选题】The slope of the line with equation y=ax+b is greater than the slope of the line with equation y=cx+b.Which of the following statements mustbe true about the relationship between a and c?
A.
a≤c
B.
ac E.a≥c+1
【判断题】We can use query languages to express the relational databases. The "query" language is not only including the function of retrieving information from database, but also the insertion, deletion, and u...
A.
正确
B.
错误
【单选题】What does the term “atomic” mean in the context of relational databases?
A.
One unit of information that cannot be decomposed.
B.
A column or row of data. Depends on the context.
C.
A tuple that cannot be reduced.
D.
Fixed schema of a particular database.
【单选题】The reason that many people find it hard to relax these days is that________．
A.
they are suffering from the effects of excessive stress
B.
they are working harder than they used to
C.
they are often too busy to find time
D.
they have no idea what relaxation means to them
【单选题】Relational databases represent relationships using ________.
A.
foreign keys
B.
file systems
C.
metadata
D.
primary keys
E.
trees
【单选题】Which of the following technologies is better equipped than relational databases to handle big data?
A.
MySQL
B.
Hadoop
C.
ETL
D.
SQL Server
【单选题】The slope of the consumption function is
A.
less than the slope of the 45-degree line but not equal to zero.
B.
greater than the slope of the 45-degree line.
C.
equal to the slope of the 45-degree line.
D.
equal to zero.
【单选题】Find the slope of the line through P (–9,1) and Q (–3,–11).
A.
m = –1
B.
m = –2
C.
m = –4
D.
m = –3
E.
m = 0
【简答题】As 20th century approaches, we can find ________________ (更多女性进入电影行业).
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