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SAP:有道sap,abap的单选选择题,最好能翻译一下题和答案的内容.1:An IDOC structure is c

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SAP:
有道sap,abap的单选选择题,最好能翻译一下题和答案的内容.
1:An IDOC structure is composed of:
Select an answer
A.One substructure,consisting of several fields
B.Several substructures,each made up of several data fields
C.Several segments,each segment having several substructures
D.Several segments,each segment consisting of several data fields
选b,课本第52页第三段,同学你上课能认真点吗?