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【判断题】
设线性方程组AX=0有非零解,则AX=0存在唯一的基础解系。A.
正确
B.
错误
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反馈参考答案：
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】Find the slope of the line passing through the pair of points.
A.
m = 5
B.
m = 1
C.
m = 2
D.
m = -1
E.
none of these
【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
【简答题】How do we find the slope of a nonlinear curve?
【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】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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