下述属于用例之间关系的是()。 A: extends B: uses C: dependson D: inheritances

All except which one of the following are good ways to acquire money for starting an investment program? A: pay bills first, and then save a reasonable amount of money for investment B: participate in an elective savings program offered by your employer C: make a special savings effort one month per year D: borrow money specifically for investment purposes E: take advantage of gifts, inheritances, and windfalls

在用例建模的过程中，若几个用例执行了同样的功能步骤，这时可以把这些公共步骤提取成独立的用例，这种用例称为（）。在UML的用例图上，将用例之间的这种关系标记为（）。 在UML的用例图上，将用例之间的这种关系标记为（）。 A: association B: extends C: uses D: inheritances