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有如下程序，该程序的执行结果是【6】。Private Sub Command1 Click() For i=1 To 4 x=4 For j=1 To i x =3 For k=1 To 2 x= x + 5 Next k Next j Next i Print x End Sub

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在传统集合运算中，假定有关系R和s，运算结果为RS。如果RS中的元组属于R而不属于S，则RS是【5】运算的结果；

原始决策与追踪决策各有哪些特点我们一般作出的决策是哪一种

高度为h(h＞O)的二叉树最少有【3】个结点。

Study Activities in University In order to help college and university students in the process of learning, four key study activities havebeen designed and used to encourage them to make knowledge their own. Ⅰ essay writing: central focus of university work esp. in the humanities, e.g.(l) (1) Benefits: 1) helping to select interesting content in books and to express understanding. 2) enabling teachers to know progress and to offer (2) (2) 3) familiarizing students with exam forms. Ⅱ seminars and classroom discussion: another form to internalize knowledge in specialized contexts. Benefits: 1) (3) enables you to know the effectiveness of your (3) expression and others’ response to your speech immediately. 2) Within the same period of time, more topics can be dealt with than in (4) (4) 3) The use of a broader range of knowledge is encouraged. Ⅲ individual tutorials: a substitute for group discussion. Format: from teacher (5) to flexible conversation. (5) Benefit: encouraging ideas and interaction. Ⅳ lectures: a most (6) used study activity. (6) Disadvantages: 1) less (7) than discussions or tutorials. (7) 2) more demanding in note-taking. Advantages: 1) providing a general (8) of a subject under discussion. (8) 2) offering more easily understood versions of a theory. 3) updating students on (9) developments. (9) 4) allowing students to following different (10) . (10) __