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小王毕业于某外语学院,2年前通过公务员录用考试,现在××部作为公务员努力工作,他的一位在异国定居的哥哥给他来信,说已为他联系好一所大学,并争取到了奖学金,让他辞掉工作,速去学习深造。经过反复考虑,小王终于下定决心辞掉工作去国外留学。但他向所在单位提出申请时,有关部门的领导说小王工作时间不到可辞职的年限,不能批准。小王对此很想不通,认为辞职是公务员的权利,不批准是不对的。而他的同事却笑他不明白国家公务员辞职制度。 谈谈你的看法。

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已知某教务管理系统有下列关系模式(带下划线的属性是主码): 系(系号,系名) 学生(学号,姓名,性别,入学日期,正常毕业日期,所在系号) 课程(课程号,课程名,学分,开课系号,教师号) 选课(学号,课程号,成绩) 教师(教师号,姓名,职称,所在系号) ①请根据给出的关系模式画出该系统的E-R图,图中忽略实体集的属性,但如果实体集之间的联系有属性则需要给出联系属性。 ②随着教学改革的需要,该系统需要满足下列需求: 需为课程增加先修课信息(一门课程可有多门先修课程);

设窗体上有一个标签Label1和一个计时器Timer1,Timer1的Interval属性被设置为1000,Enabled属性被设置为True。要求程序运行时每秒在标签中显示一次系统当前时间。以下可以实现上述要求的事件过程是( )。

A) Private Sub Tiiner1_Timer( )
B. Label1. Caption = True
C. End Sub
D. B) private Sub Timer1_Timer ( )
E. Label1. Caption = Time $
F. End Sub
G. C) Private Sub Timerl_Timer( )
H. Label1. Interval = 1
I. End Sub
J. D) Private Sub Timer1_Timer( )
K. For k = 1 To Timer1. Interval
Label1. Caption = Timer
M. Next k
N. End Sub

某公司需建立产品信息数据库,经调查其业务要求如下: Ⅰ.一种产品可以使用多个不同种类的部件,也可以使用多个不同种类的零件;一种部件至少被用在一种产品中;一种部件可以由多个不同种类的零件组成;一种零件至少被用在一种产品或一种部件中。 Ⅱ.对于一种具体的部件,要记录这种部件使用的各种零件的数量。 Ⅲ.对于一种具体的产品,要记录这种产品使用的各种部件数量和各种零件数量,但部件所使用的零件数量不计入该种产品的零件数量。 Ⅳ.一个供应商可供应多种零件,但一种零件只能由一个供应商供应。 根据以上业务要求,某建模人员构建了如下E-R图: 此E-R图中的实体的属性完整,但实体、联系的设计存在不合理之处。 根据重构的E-R图给出符合3NF的关系模式,并标出每个关系模式的主码和外码。

Task 3The difficulties that would have to be encountered by anyone who attempted to explore the Moon would be incomparably greater than those that have to be faced in the endeavor to reach the summit of Mount Jolmo Lungma. In two respects only would the lunar explorer have the advantage. In the first place movement would be less fatiguing because the gravitational pull of the Moon is not very great, the weight of the Moon being only about one - eightieth of that of the Earth. If the Moon had an atmosphere like that of the Earth, a man playing golf on the Moon would find that he could drive his ball for a mile without much difficulty. The second advantage the lunar explorer would have over the climbers on Mount Jolmo Lungma would be the absence of strong wind to contend against. The Moon having no atmosphere, there can be no wind nor, of course, can there be any noise, for sound is carried by the air. The Moon is a world that is completely still and where utter silence prevails. Walking on the Moon is().

A. more exhausting than climbing Mount Jolmo Lungma
B. less exhausting than climbing Mount Jolmo Lungma
C. more dangerous than climbing Mount Jolmo Lungma
D. less dangerous than climbing Mount Jolmo Lungma

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