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J．Martin的企业信息技术模型中______和信息资源的战略规划是保持稳定的最低两层。
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23～24 题基于以下说明。设有三个关系： 学生关系S(SNO,SNAME,AGE,SEX) (分别代表学生的学号、姓名、年龄、性别) 学习关系SC(SNO,CNO,GRADE) (分别代表学生的学号、课程编号、成绩) 课程关系C(CNO,CNAME,TEACHER) (分别代表课程的编号、课程名、任课教师) 在关系SC中，查询学习课程号为′DB′，且成绩在60至90之间的学生学号的正确的 SQL命令是
TextOne of the advantages of taking notes is that it forces you to pay closer attention to the class lecture. If you listen (26) to a professor who is talking on and on for an hour or so, your mind will often (27) and your attention lessen. You arc sitting in class and listening, but that (28) you are doing; (29) when you listen actively you have to pay more careful and (30) attention to what (31) . This is because you are trying to (32) what you bear into an (33) , shortened written form. As a foreign student, you may find (34) very difficult to listen and write notes (35) at the same time. It is difficult (36) , but you will learn how to do (37) with practice. You (38) afraid you will forget what you are listening to (39) you are listening and writing at same time, but the studies of researchers (40) the value of note-taking in (41) lecture material have shown that learners remember (42) reproduced in some note form much better than lecture information they have listened to (43) down in note form. So doing two things at the same time is better than doing one thing. (44) . We do not say it is (45) ; we say it is better. 27().
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