LR(k)方法是(19)。

未分类题二维离散型随机变量(X，Y)的联合分布如下图，那么，x与Y之间的关系是(65)。A．相关但不独立B．独立但不相关C．相关且独立D．既不独立也不相关

未分类题In the following essay, each blank has four choices. Choose the best answer and write down on the answer sheet. How does the developer of a large database system achieve(71)and data independence? How does the developer make certain that stored items are(72)and do not simply disappear in the immensities of the database, as if in quicksand? One solution is to set up a(73)system, in which all data (the internal level), all records and files (the conceptual level), and all user interfaces (the external level) are controlled by one central programming group. This may seem the most useful solution. But worldwide enterprises such as the meteorological and satellite tracking networks, IBM, and General Motors gather and record information at a very large number of locations. To stay flexible and avoid top - heaviness, such an organization might want to avoid excessive centralization. A centralized system is(74), but it may not be responsive to user needs. This is particularly true in a large organization - the worldwide meteorological network, for example, Data-gathering methods in the Himalayas, the equatorial jungles are different in very possible way. It is reasonable to believe that the best choices for the corresponding data storage and access structures ought to be just as different. A centralized database system would not(75)such differences.A．consistencyB．identificationC．coherenceD．convergence

单项选择题如果消费者消费的商品X和商品Y的价格之比为1.25，它们的边际效用之比为2，那么消费应该( )。 A．增加对X的购买和减少对Y的购买 B．增加对Y的购买和减少对X的购买 C．同时增加对X和Y的购买 D．同时减少对X和Y的购买

单项选择题已知某正常商品的价格下降时，替代效应为+2，则收入效应可能为( )。 A．-4 B．-2 C．-1 D．+1

未分类题某外国甲公司欲与中国乙公司共同兴办中外合资经营企业,双方合作企业设在北京。下列不属于中国合作者向审批机关申请设立中外合作企业时应提交的文件包括( )。

单项选择题当两种商品X和Y的效用函数为U(X，Y)＝XY时，下列效用函数中描述了相同的偏好次序的是( )。 A．U＝(X-5)(Y-5) B．U＝(X 5)(Y 5) C．U＝(X+5)(Y+5) D．B和C都正确

未分类题 ‍‍下列属于有效的薪酬管理应遵循的基本原则的是‍‍ A.对内具有竞争力原则 B.对外具有公正性原则 C.对员工具有合理性原则 D.对成本具有控制性原则

单项选择题卢卡斯喜欢将两种不同的三明治作为自带午餐：花生黄油加奶油干酪三明治和奶油干酪加果子冻三明治。对于卢卡斯来说，下列选项中正确的是( )。 A．花生黄油和果子冻是互补品 B．奶油干酪和果子冻是替代品 C．花生黄油和奶油干酪是替代品 D．花生黄油和果子冻是替代品

单项选择题假如孙悟空偏好猕猴桃甚于蟠桃，这是因为( )。 A．猕猴桃的价格最低 B．猕猴桃紧俏 C．猕猴桃有多种用途 D．对于孙悟空而言，猕猴桃的效用更大

未分类题阅读下面短文，回答下列五道题。 转基因作物同普通植物的区别只是多了能使它产生额外特性的基因。早在1983年，生物学家就已经知道怎样通过生物工程技术将外来基因移植到某种植物的脱氧核糖核酸中去，以便使它产生靠杂交方式根本无法获得的某种新的特性：抗除莠剂的特性、抗植物病毒的特性、抗某种害虫的特性等。用以移植的基因可来自任何生命体：细菌、病毒、昆虫等。 转基因作物目前在世界上已种植有1 000万公顷左右，种植最多的是棉花、玉米和西红柿等。在实验室试种的还有莴笋、西瓜、稻谷等品种。试验的目的除了增产之外，还在于提高这种品种的抗病毒能力。 但同时也有专家担心转基因作物可能对环境有危险。比如，在美国种植的那种能抗虫害的玉米和棉花，可能加快出现—些更难对付的害虫。这类作物的所有分子都分泌出—些微量的“杀虫药”，一种像任何一种农药一样能选择杀死某些害虫的“雾剂”。尤其是那些能抗除莠剂的作物，它们—旦同野生状态下的“表姐妹”杂交之后，那些“表姐妹”也就会因此而成为除莠剂无法除掉的变种了。 对于这种技术，尽管还有些问题需要继续研究，但这确是人类9000年作物栽培史上一场空前的革命。根据文意，对“转基因作物”理解正确的一项是______。

未分类题下列关于工伤保险责任的说法，错误的是 A.职工被派遣出境工作，依据前往国家或者地区的法律应当参加当地工伤保险的，参加当地工伤保险 B.职工被派遣出境工作，不能参加当地工伤保险的，其国内工伤保险关系不中止 C.用人单位实行承包经营的，工伤保险责任由职工劳动关系所在单位承担 D.职工被借调期间受到工伤事故伤害的，由借调单位承担工伤保险责任

未分类题听力原文：M: I have a problem, and I hope you can help me out.W: What's your problem?M: I need to be absent from class on next Friday because I have a doctor's appointment, and I'll need to borrow someone's notes.W: Well, you can certainly borrow mine, if you don't mind my messy handwriting.M: Thanks very much. Notes in messy handwriting are much better than no notes at all. W: In that case, just come to me when you are back. By the way, do you enjoy playing chess?M: Yes, I really do. Why?W: Well, you might think about joining the chess club. I belong to it, and it's a lot of fun.M: What does the chess club do?W: The members get together once a week for friendly competitions. Then each semester, the three best players from the club compete in a tournament with players from other schools.M: The meetings once a week sound like a lot of fun, but I don't think I'm ready to take part in a tournament against other schools.W: Well, why don't you come with me this Wednesday and try out one of the weekly meetings? You can come to the meetings for a while and then see if you're ready to compete in a tournament in a few months.What problem does the man have?A．He was absent from class.B．He missed his doctor's appointment.C．He has messy handwriting.D．He will miss class later in the week.

单项选择题以Y表示纵轴，以X表示横轴，预算线以它与横轴的交点为定点向外移动的原因是( )。 A．商品X的价格下降 B．商品Y的价格下降 C．商品X和商品Y的价格同时上升 D．消费者的收入增加

未分类题听力原文：W: These summer days are getting to be more than I can take. It was even too hot to go to the pool yesterday.M: Hold on. According to the weather report we should have some relief by the end of the week.W: The weather report can never be relied on.What does the man mean?A．The pool will be open all week.B．The weather will cool down soon.C．The woman should go swimming.D．He prefers to stay inside in hot weather.

未分类题下列关于实现资源共享说法不正确的是 A.企业的组织机构设置为资源共享提供了组织基础 B.将各组织机构的优势培训资源向系统内推介，有利于企业组织系统内部之间的交流学习 C.实行资源共享是企业内部开展培训的优势所在 D: 赞同并支持培训资源共享的组织结构不多