SparkGraphX中类Graph的reverse方法可以（)。

A.Graph(vertices,edges,defaultVertexAttr)

B.Graph.fromEdges(RDD[Edge[ED]],defaultValue)

C.Graph.fromEdgeTuples(rawEdges:RDD[(VertexId,VertexId)],defaultValue,)

D.GraphLoader.edgeListFile(sc,filename)

epresent a complete multimedia information.

常见的两类聚类法分别为（)型聚类和R型聚类。

设有关系模式R(A，B，C，D)，F={(A，D)→C，C→B}

则：(1) 求出R的所有候选码。

(2) 该模式是哪一类范式，为什么？

A.扩散力强

B.繁殖力弱

C.种群竞争力激烈

D.食性狭

设A={1，2，3，4}，R是A上的等价关系，且R在A上所构成的等价类是{1}，{2，3，4}。（1)求R。（2)求R•R^-1。（3)求R的传递闭包。

A.A

B.D

C.G

D.J

E.K

F.R

A={1.2,3,4,5},R=,简答以下各题.

(1)画出R的关系图.

(2)R是否为A上的等价关系？如果是,求出R的各等价类.

ery small. [B] the new pyramid is definitely doomed to be a failure. [C] political influence will never be waved from the design. [D] the Potato Board of the country is very influential.

How to Save Web Page Information

You can save the whole web page or part of its contents(text,graph or linkage)as file kept on disk.They can be displayed or used in other files,also sent to other,or printed.

To save web pages,you can；

Save the current web pages in your computer.To do that,single click"save as"on"file"menu,and on the"save web page"dialogue box select the folder for saving web pages,and on the"file name"input the file name of this web page,then single click "save"button；

Duplicate the information from the web page to file.To do that,you select the infor mation on the web page to be saved(if you want to save the whole web page,then single click"all select"button on"edit"menu、and single click"copy"on"edit"menu.Finally,turn to the procedure for editing the information(for example,word),single click the position where the information is stored and then single click the "paste"on"edit"menu.