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提问人：网友cui163007 发布时间：2022-01-06

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Consider a relation R （A，B，C，D ) with the following dependencies： AB ？ C, CD ？ E, DE ？B.A

Consider a relation R (A，B，C，D ) with the following dependencies： AB ？ C, CD ？ E, DE ？B.

A．AB

B．ABC

C．ABD

D．ABE

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更多“Consider a relation R （A，B，C，D ) with the following dependencies： AB ？ C, CD ？ E, DE ？B.A”相关的问题

第1题

Doctors and nurses working in anesthesiology department, _____________（急诊室) and department of pediatrics are more likely to consider their relation with patients inharmonious.

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第2题

For Burgers'equation [图] with initial data [图], ...

For Burgers'equation For Burgers'equation [图] with initial data [图], .. with initial data, consider a traveling wave solutionin terms of, and the Rankine-Hugoniot relation is ____. (define)

A、 For Burgers'equation [图] with initial data [图], ..

B、 For Burgers'equation [图] with initial data [图], ..

C、 For Burgers'equation [图] with initial data [图], ..

D、 For Burgers'equation [图] with initial data [图], ..

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第3题

考虑一下包括A、B、C的一组人，以及“A与B至少一样高”中的“至少一样高”的关系。这种关系是传递的吗？

是完备的吗？

Consider a group of people A，B，C and the relation“at least as tall as，”as in“A is at least as tall as B.”Is this relation transitive？Is it complete？

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第4题

取同样一组人，然后考虑一下“的确比……高”这样一种关系。这种关系是传递的吗？反身的吗？完备的吗？Take the same group of people and consider the relation“strictly taller than.”Is this relation transitive？Is it reflexive？Is it complete？

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第5题

One of the difficulties in building an SQL-like query language for the Web is the absence

of a database(131)for this huge, heterogeneous repository of information. However, if we are interested in HTML documents only, we can construct a virtual schema from the implicit structure of these files. Thus, at the highest level of(132), every such document is identified by its Uniform. Resource Locator(URL), and a(133)and a text. Also, Web severs provide some additional information such as the type, length, and the last modification date of a document. So for data mining purposes, we can consider the set of all HTML documents as a relation:Document(url, rifle, text, type, length, modif)Where all the(134)are character strings. In this framework, an individual document is identified with a(135)in this relation. Of course, if some optional information is missing from the HTML document, the associate fields will be left blank, but this is not uncommon in any database.

A．schema

B．platform

C．module

D．relation

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第6题

One of the difficulties in building an SQL,like query language for the Web is the absence

of a database(71) for this huge, heterogeneous repository of information. However, if we are interested in HTML documents only, we can construct a virtual schema from the implicit structure of these files. Thus, at the highest level of(72) , every such document is identified by its Uniform. Resource Locator(URL), has a(73) and a text. Also, Web servers provide some additional information such as the type, length, and the last modification date of a document. So, for data mining purposes, we can consider the set of all HTML documents as a relation:Document(url, title, text, type, length, modif)Where all the(74) are character strings. In this framework, an individual document is identified with a(75) in this relation. Of course, if some optional information is missing from the HTML document, the associate fields will be left blank, but this is not uncommon in any database.

A．schema

B．platform

C．module

D．relation

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第7题

STUDY TIP Seminal works in academic settings are t...

STUDY TIP Seminal works in academic settings are the ones of central importance to a research topic. Often they report a major breakthrough, an insight or a novel thinking that stimulates later thinking. The seminal works are, in many cases, a good place to begin research, and lead to other relevant studies. The works bearing the closest relation to the present research are usually stated last before the author’s own hypothesis being proposed, functioning as the stepping stone towards this one-step-further study. As part of a course on economy and environment, you are asked to find some seminal models proposed to study how economic activities lead to environmental degradation. Where are you going to start？ Weigh the following approaches and pick out the one you consider most efficient and effective.

A、Google ‘seminal models of economic activities’

B、Go to the library and look for possible books on the shelf

C、Locate seminal models from what others mentioned in relevant studies of the topic

D、Search ‘seminal economic models’ as key words from E-database of papers on economics

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第8题

选出应填入下面一段英语中______内的正确答案。 One of the difficulties in building an SQL-like query l

选出应填入下面一段英语中______内的正确答案。

One of the difficulties in building an SQL-like query language for the Web is the absence of a database(1)for this huge, heterogeneous repository ofinformation. However, if we are interested in HTML documents only, we can construct a virtual schema from the implicit structure ofthese files. Thus, at the highest level of(2), every such document is identified by its Uniform Resource Locator (URL), a(3)and a text. Also, Web servers provide some additional information such as the type, length, and the last modification date of a document. So, for data mining purposes, we can consider the set of all HTML documents as a relation:

Document (url, title, text,type, length, modify)

Where all the(4)are character strings. In this framework, an individual document is identified with a(5)in this relation. Ofcourse, if some optional information is missing from the HTML document, the associate fields will be left blank, but this is not uncommon in any database.

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第9题

Jackdaw Motor Cars Co （Jackdaw) manufactures a range of motor cars and its year end is 31

Jackdaw Motor Cars Co (Jackdaw) manufactures a range of motor cars and its year end is 31 January 2015. You are the audit supervisor of Puffin & Co and are currently preparing the audit programmes for the year-end audit of Jackdaw. You have had a meeting with your audit manager and he has notified you of a number of issues identified during the audit risk assessment process.

Land and buildings

Jackdaw have a policy of revaluing land and buildings, this is undertaken on a rolling basis over a five-year period. During the year Jackdaw requested an external valuer to revalue a number of properties, including a warehouse purchased in May 2014. Depreciation is charged on a pro rata basis.

Work in progress

Jackdaw undertakes continuous production of cars, 24 hours a day, seven days a week. An inventory count is to be undertaken at the year end and Puffin & Co will attend. You are responsible for the audit of work in progress (WIP) and will be part of the team attending the count as well as the final audit. WIP constitutes the partly assembled cars at the year end and this balance is likely to be material. Jackdaw values WIP according to percentage of completion, and standard costs are then applied to these percentages.

Required:

(a) Explain the factors Puffin & Co should consider when placing reliance on the work of the independent valuer. (5 marks)

(b) Describe the substantive procedures the auditor should perform. to obtain sufficient and appropriate audit evidence in relation to:

(i) The revaluation of land and buildings and the recently purchased warehouse; and (6 marks)

(ii) The valuation of work in progress. (4 marks)

(c) During the audit, your team has identified an error in the valuation of work in progress, as a number of the assumptions contain out of date information. The directors of Jackdaw have indicated that they do not wish to amend the financial statements.

Required:

Explain the steps Puffin & Co should now take and the impact on the audit report in relation to the directors’ refusal to amend the financial statements. (5 marks)

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第10题

The human criterion for perfect vision is 20/20 for reading the standard lines on a Snelle

n eye chart without a hitch. The score is determined by how well you read lines of letters of different sizes from 20 feet away. But being able to read the bottom line on the eye chart does not approximate perfection as far as other species are concerned. Most birds would consider us very visually handicapped. The hawk, for instance, has such sharp eyes that it can spot a dime on the sidewalk while perched on top of the Empire State Building. It can make fine visual distinctions because it is blessed with one million cones (视锥细胞) per square millimeter in its retina (视网膜). And in water, humans are farsighted, while the kingfisher, swooping down to spear fish, can see well in both the air and water because it is endowed with two foveae(凹窝)-areas of the eye, consisting mostly of cones, that provide visual distinctions. One fovea permits the bird, while in the air, to scan the water below with one eye at a time. This is called monocular vision. Once it hits the water, the other fovea joins in, allowing the kingfisher to focus both eyes, like binoculars, on its prey at the same time. A frog's vision is distinguished by its ability to perceive things as a constant motion picture. Known as "bug detectors", a highly developed set of cells in a frog's eyes responds mainly to moving objects. So, it is said that a frog sitting in a field of dead bugs wouldn't see them as food and would starve.

The bee has a "compound" eye, which is used for navigation. It has 15,000 facets that divide what it sees into a pattern of dots, or mosaic. With this kind of vision, the bee sees the sun only as a single dot, a constant point of reference. Thus, the eye is a superb navigational instrument that constantly measures the angle of its line of flight in relation to the sun. A bee's eye also gauges flight speed. And if that is not enough to leave our 20/20 "perfect vision" paling into insignificance, the bee is capable of seeing something we can't ultraviolet light. Thus, what humans consider to be "perfect vision" is in fact rather limited when we look at other species.

However, there is still much to be said for the human eye. Of all the mammals, only humans and some primates can enjoy the pleasures of color vision.

The Snellen eye chart measures one's eyesight by ______.

A．the number of lines he reads

B．the number of letter he reads

C．the distance he stands away from the chart

D．the speed at which he recognizes the letters

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