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【判断题】
三角板与丁字尺配合可以画与丁字尺工作15度、30度、45度、60度、75度等各种斜线。A.
正确
B.
错误
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举一反三
【简答题】数据模型有层次数据模型、 、
【单选题】Which is correct for function of regular expression
A.
Judge whether the input match pattern
B.
Find substring in input that match pattern
C.
Replace substring that match pattern with given string
D.
Options above are all correct
【单选题】About the Data Storage and Querying, which is correct for the following statements?
A.
Data Storage is for efficient storing data to the database, however, the query processor is for easy to access data.
B.
As the function, there is no significant differences between Data Storage and query processor.
C.
Data Storage is for storing data and accessing data.
D.
Query processor can only deal with the select statement.
【简答题】在数据模型中,常见的数据模型有层次数据模型、网状数据模型、_____和面向对象数据模型。
【简答题】数据库系统中所支持的主要逻辑数据模型有 、 、 、和面向对象模型。
【多选题】Which description is correct for
A.
f(x)=1/3.
B.
f(x)=1/3.
C.
f(2)=1/3.
D.
f(x) is a discontinuous at x=2.
E.
f(x) is a discontinuous at x=-1.
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