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【单选题】
UseCase用来描述系统在事件做出响应采取的行动。用例之间是具有相关性的。在一个“订单输入子系统”中,创建新订单和更新订单都需要检查用户帐号是否正确。那么,用例“创建新订单”、“更新订单”与用例“检查用户帐号”之间是()关系A.
aggregation
B.
extend
C.
include
D.
classification
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