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[主观题]

In which three cases would you use the USING clause？（）

A.You want to create a nonequijoin.

B.The tables to be joined have multiple NULL columns.

C.The tables to be joined have columns of the same name and different data types.

D.The tables to be joined have columns with the same name and compatible data types.

E.You want to use a NATURAL join, but you want to restrict the number of columns in the join condition.

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更多“In which three cases would you…”相关的问题

第1题

你认为下面哪个句子的介词运用是合适的？

A.In 2003, when Guangzhou was hit by SARS, the Guangzhou University of Chinese Medicine admitted 74 patients infected with the SARS virus, among which only three cases were treated with hormone therapy, with none of the patients haunted by after effects after recovery.#B.During the 2003 SARS outbreak, the Guangzhou University of Chinese Medicine admitted 74 SARS patients, three of which were treated using hormone therapy, without exhibiti

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第2题

Which three components of the Cisco SMB Assistant Service？（）

A. Advanced replacement on the next business day

B. Support for every Cisco Product

C. Cases Opened Via E-mail or Telephone at any time

D. Immediate Support from the Cisco TAC Engineers

E. NBD callback from a Specialized Engineer During Regular Business Hours

F. Support for low-end products only

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第3题

The objective of （）is to determine what parts of the application software will be assigne

d to what hardware.The major software components of the system being developed have to be identified and then allocated to the various hardware components on which the system will operate. All software systems can be divided into four basic functions. The first is（）. Most information systems require data to be stored and retrieved,whether a small file,such as a memo produced by a word processor,or a large database,such as one that stores an organization’s accounting records. The second function is the （）,the processing required to access data,which often means database queries in Structured Query Language. The third function is the （）,which is the logic documented in the DFDs,use cases,and functional requirements.The fourth function is the presentation logic,the display of information to the user and the acceptance of the user’s commands.The three primary hardware components of a system are （）.

A.architecture design B.modular design C.physical design D.distribution design A.data access components B.database management system C.data storage D.data entities A.data persistence B.data access objects C.database connection D.dataaccess logic A.system requirements B.system architecture C.application logic D.application program A.computers,cables and network B.clients,servers,and network C.CPUs,memories and I/O devices D.CPUs,hard disks and I/O devices

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第4题

The outbreak of swine flu that was first detected in Mexico was declared a global epidemic

on June 11,2009．It is the first worldwide epidemic【1】by the World Health Organization in 41 years.

The heightened alert【2】an emergency meeting with flu experts in Geneva that assembled after a sharp rise in cases in Australia, and rising【3】in Britain, Japan, Chile and elsewhere.

But the epidemic is "【4】" in severity, according to Margaret Chan, the organization's director general,【5】the overwhelming majority of patients experiencing only mild symptoms and a full recovery, often in the【6】of any medical treatment.

The outbreak came to global【7】in late April 2009, when Mexican authorities noted an unusually large number of hospitalizations and deaths【8】healthy adults. As much of Mexico City shut down at the height of a panic, cases began to【9】in New York City, the southwestern United States and around the world.

In the United States, new cases seemed to fade【10】warmer weather arrived. But in late September 2009, officials reported there was【11】flu activity in almost every state and that virtually all the【12】tested are the new swine flu, also known as (A) H1N1, not seasonal flu. In the U. S. , it has【13】more than one million people, and caused more than 600 deaths and more than 6,000 hospitalizations.

Federal health officials【14】Tamiflu for children from the national stockpile and began【15】orders from the states for the new swine flu vaccine. The new vaccine, which is different from the annual flu vaccine, is【16】ahead of expectations. More than three million doses were to be made available in early October 2009, though most of those【17】dose were of the FluMist nasal spray type, which is not【18】for pregnant women, people over 50 or those with breathing difficulties, heart disease or several other【19】. But it was still possible to vaccinate people in other high-risk groups: health care workers, people【20】infants and healthy young people.

(1)

A．criticized

B．appointed

C．commented

D．designated

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第5题

Scientists around the world are racing to learn how to rapidly diagnose, treat and stop th

e spread of a new, deadly disease. SARS—Severe Acute Respiratory Syndrome—was 【31】______ for the first time in February 2003 in Hanoi, 【32】______ since then has infected more than 1,600 people in 15 countries, killing 63. At this 【33】______ , there are more questions than answers surrounding the disease. Symptoms start 【34】______ a fever over 100.4 degrees F, chills, headache or body 【35】______. Within a week, the patient has a dry cough, which might 【36】______ to shortness of breath. In 10% to 20% of cases, patients require 【37】______ ventilation to breathe. About 3.5% die from the disease. Symptoms 【38】______ begin in two to seven days, but some reports suggest it 【39】______ take as long as 10 days. Scientists are close to 【40】______ a lab test to diagnose SARS. In the meantime, it is diagnosed by its symptoms. There is no evidence 【41】______ antibiotics or anti-viral medicines help, 【42】______ doctors can offer only supportive care. Patients with SARS are kept in isolation to reduce the risk of 【43】______ . Scientists aren't sure yet, but some researchers think it's a 【44】______ discovered corona virus, the family of viruses that cause some common colds. Most cases appear to have been passed 【45】______ droplets expelled when infected patients cough or sneeze. Family members of infected people and medical workers who care 【46】______ them have been most likely to 【47】______ the illness. But recent developments in Hong Kong suggest that the 【48】______ might spread through air, or that the virus might 【49】______ for two to three hours on doorknobs or other 【50】______ . Health experts say it is unlikely, though, that sharing an elevator briefly with an infected person would be enough to pass the virus.

A．detected

B．caught

C．disclosed

D．revealed

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第6题

第二组：Magnetic pickup （MPU) sensors are devices which can be used in conjunction with ele

第二组：Magnetic pickup (MPU) sensors are devices which can be used in conjunction with electronic control modules for monitoring of parameters such as speed, direction of rotation and a variety of alarm conditions. MPU sensors are available in various sizes and types. Following are some guidelines for their selection on industrial engines. MPUs are located near a flywheel, camshaft or other type of gear with rotation relative to engine speed. The passing of the gear teeth through the MPU tip (pole) generates a voltage and frequency. This frequency is converted to a speed reference by a control module. It should be noted here that most MPUs will develop similar signals. However, the magnitude and strength of the signal is dependent on the size of the sensor in relation to the gear teeth, the clearance between the pole piece and the gear teeth, and various other factors. As a general rule of thumb, the following standards should be met:

①Dimension of tooth top surface should be equal to or more than the pole piece diameter.

②Tooth height should be equal to, or more than the space between teeth.

③The space between teeth should be approximately three times the pole piece diameter.

④Air gap (clearance) between tooth and pole piece should be between 0.015" to 0.030". MPUs

normally have 3/8", 5/8" threads and 2", 3" and 4" lengths. Determining which size is appropriate

depends on the space available for installation, the availability of pre-drilled holes and consideration to

those rules mentioned above. In most cases, these will be the only factors affecting the selcetion of a

MPU.

MPUs can be used to ____.①sense speed ②supply alarm ③sense direction of rotation.

A.①②

B.②③

C.①③

D.①②③

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第7题

In the following cases, which carding action occurs？

In the following cases, which carding action occur

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第8题

Standard usage includes those words and expressions understood, used, and accepted by a ma

jority of the speakers of a language in any situation regardless of the level of formality. As such, these words and expressions are well defined and listed in standard dictionaries. Colloquialisms, on the other hand, are familiar words and idioms that are understood by almost all speakers of language and used in informal speech or writing, but not considered acceptable for more formal situations. Almost all idiomatic expressions are colloquial language. Slang, however, refers to words and expressions understood by a large number of speakers but not accepted as appropriate formal usage by the majority. Colloquial expressions and even slang may be found in standard dictionaries but will be so identified. Both Colloquial usage and slang are more common in speech than in writing.

Colloquial speech often passes into standard speech. Some slang also passes into standard speech, but other slang expressions enjoy momentary popularity followed by obscurity. In some cases, the majority never accepts certain slang phrases but nevertheless retains them in their collective memories. Every generation seems to require its own set of words to describe familiar objects and events.

It has been pointed out by a number of linguists that three cultural conditions are necessary for the creation of a large body of slang expressions. First, the introduction and acceptance of new objects and situations in the society; second, a diverse population with a large number of subgroups; third, association among the subgroups and the majority population.

Finally, it is worth noting that the terms "standard," "colloquial," and "slang" exist only as abstract labels for scholars who study language. Only a tiny number of the speakers of any language will be aware that they are using colloquial or slang expressions. Most speakers of English will, during appropriate situations, select and use all three types of expressions.

Which of the following is the main topic of the passage？

A．Standard speech.

B．Idiomatic speech.

C．Different types of speech.

D．Dictionary. usage.

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第9题

Commercial Banks are an institution which accepts deposits, makes __________, and offe

A.loans

B.cases

C.decisions

D.orders

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第10题

In America, every student in his or her second year of high school is required to take a c

lass in driver's education.

The course is divided up into two parts: class time for learning laws and regulations and driving time to practice driving. Each student is required to drive a total of six hours. The students are divided up into groups of four. The students and the instructor go out driving for two hour blocks of time. Thus, each student gets half an hour driving time per outing. Drivers Ed cars are unlike other cars in which they have two sets of brakes, one on the driver's side and one on the other side where the instructor sits. Thus, if the student driver should run into difficulties the instructor can take over.

After a student has passed the driver's education course and reached the appropriate age to drive (this age differs in every state but in most cases the person must be 16 years old), he must take his driver's test. The person must pass all three tests in order to be given a driver's license. If the person does well in his or her driver's education class, he or she will pass the test with flying colors and get a driver's license.

In America, the driver's course mentioned above______.

A．is considered as part of the advanced education

B．is given to anyone wanting to get a driver's license

C．is carried on after students graduate from high school

D．is offered to all the students of Grade 2 in high school

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