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[单选题] ( )analysis emphasizes the drawing of pictorial system models to document and validate both existing and/or proposed systems. Ultimately, the system models become the( )for designing and constructing an improved system.( )is such a technique. The emphasis in this technique is process-centered. Systems analysts draw a series of process models called(请作答此空) 、 ( ) is another such technique that integrates data and process concerns into constructs called objects.A.PERTB.DFDC.ERDD.UML

A.见图A

B.见图B

C.见图C

D.见图D

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