题目
In the following statements about graph operations,which one is NOT correct?
A.Finding critical path is an operation on directed graph
B.Finding critical path is an operation on undirected graph
C.Spanning tree of a graph may not be unique
D.Minimum spanning tree of a graph may not be unique
第1题
Which one of following is wrong about Steve Jobs?()
A、He dropped out of college.
B、He started Apple when he was 21.
C、His real parents were died when he was born.
D、He was a Buddist.
第2题
The following suggestions increase "Programs" (1) and make them easier to (2):
1.Use a standard indention technique, blank lines, form. feeds, and spaces.
2.Insert plenty of comments into your code.
A.reliability
B.security
C.readability
D.usability
第3题
Consider the query:Mysql> SET @run = 15;Mysql> EXPLAIN SELECT objective, stage, COUNT (stage)FROM iteminformationWHERE run=@run AND objective=’7.1’GROUP BY objective,stageORDER BY stage;The iteminformation table has the following indexes;Mysql> SHOW INDEXES FROM iteminformation:This query is run several times in an application with different values in the WHERE clause in a growing data set.What is the primary improvement that can be made for this scenario?()
A.Do not pass a user variable in the WHERE clause because it limits the ability of the optimizer to use indexes
B.Add an index on the objective column so that is can be used in both the WHERE and GROUP BY operations
C.Drop the run_2 index because it has caused a conflict in the choice of key for this query
D.Execute the run_2 index because it has caused a conflict in the choice of key for this query
E.Add a composite index on (run,objective,stage) to allow the query to fully utilize an index
第6题
A.STA=1.STB=DSTC=0
B.STA=1.STB=DSTC=D
C.STA=1.STB=0.STC=D
D.STA=DSTB=0.STC=D
第9题
A.ThetunedplanisnotaddedtotheSQLplanbaseline.
B.ThetunedplanisaddedtothefixedSQLplanbaselineasafixedplan.
C.ThetunedplanisaddedtothefixedSQLplanbaselineasanonfixedplan.
D.ThetunedplanisaddedtoanewnonfixedSQLplanbaselineasanonfixedplan.
第10题
A.USE STA COPY TO STB FIELDS学号,姓名
B.USE STB COPY TO STA FIELDS学号,姓名
C.COPY STA TO STB FIELDS学号,姓名
D.COPY STB TO STA FIELDS学号,姓名
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