Customer类中有一个Set类型的orders属性，用来存放Order订单对象，在Customer.hbm.xml文件中，用哪个元素映射orders属性（）A、＜set＞B、＜one-to-many＞C、＜many-to-one＞D、＜property＞
Customer类中有一个Set类型的orders属性，用来存放Order订单对象，在Customer.hbm.xml文件中，用哪个元素映射orders属性（）
- A、＜set＞
- B、＜one-to-many＞
- C、＜many-to-one＞
- D、＜property＞
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