题目内容
在关系型数据库中，一对多就是在“一”的一方，添加“多”的一方的主键作为外键。
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MyBatis中元素的属性与元素相同，且使用也很简单，同样有嵌套查询和嵌套结果两种关联方式。
MyBatis是通过元素的子元素该元素来处理一对一关联关系的。
In this section, you will hear three passages. At the end of each passage, you will hear three or four questions. Both the passage and questions will be spoken only once. After you hear a question , you must choose the best answer from the four choices marked A),B),C)and D).Then mark the corresponding letter on Answer Sheet 1 with a single line through the centre.Passage OneQuestions l and 3 are based on the passage you have just heard.[音频]Question 1
Question 2
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