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提问人:网友zhanglietx 发布时间:2022-01-07
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The difference between a liquid and a gas is obvious under the conditions of temperature a

nd pressure commonly found at the surface of the Earth. A liquid can be kept in an open container and fill it to the level of a free surface. A gas forms no free surface but tends to dif fuse(扩散)throughout the space available; it must therefore be kept in a closed container or held by a gravitational field, as in the case of a planet's atmosphere. The distinction was a prominent feature of early theories describing the phases of matter. In the nineteenth century, for example, one theory maintained that a liquid could be "dissolved" in a vapor without losing its identity, and another theory that held the two phases are made up of different kinds of molecules: liquids and gases. The theories now prevailing take a quite different approach by emphasizing what liquids and gases have in common. They are both forms of matter that have no permanent structure, and they both flow readily. They are fluids.

The fundamental similarity of liquids and gases becomes clearly apparent when the temperature and pressure are raised somewhat. Suppose a closed container partially filled with a liquid is heated. The liquid expands, or in other words becomes less denser some of it evaporates. In contrast, the vapor above the liquid surface becomes denser as the evaporated molecules are added to it. The combination of temperature and press at which the densities be come equal is called the critical point. Above the critical point the liquid and the gas can no longer be distinguished; there is a single, undifferentiated fluid phase of uniform. density.

Which of the following would be the most appropriate title for the passage?

A.The Properities of Gases and Liquids.

B.What Fluids and Gases Are Made of.

C.New Uses for the Gas and the Liquid.

D.New Theories about Fluids and Gases.

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更多“The difference between a liquid and a gas is obvious under the conditions of temperature a”相关的问题
第1题
In the collectivist culture, the interests of the individual prevail over the interests of the group.
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第2题
The earliest writings of the ancient Mesopotamian area are believed to be created by the __________.

A、Sumerians

B、Hebrew

C、Mesopotamian

D、Philistines

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第3题

Section B Reading in Depth Directions: There are 2 passages in this part. Each passage is followed by some questions or unfinished statements. For each of them there are four choices marked A), B), C) and D). You should decide on the best choice and write the corresponding letter on the Answer Sheet. Passage One Questions 11 to 15 are based on the following passage. Most aspects of health care have been designed with a focus on the needs of the doctor or other health care provider, rather than the consumer who uses the health services. But health care is ripe for change. This culture has not been deliberately created, and often frustrates doctors and other health providers as much as patients. But it is ingrained in our health care system. The internet and technology have revolutionized the way banks and most other businesses serve their customers. That began two decades ago. Yet we are still waiting for this revolution to reach health care. For many of the most vulnerable (and chronically sick) people, it is very difficult to get the co-ordinated care they need. There are patients who are having to travel long distances to multiple doctors and specialists, to undergo an array of tests that are not co-ordinated or shared and are not flexible to fit around their schedule, because that's what suits the timetable of the hospital, service or specialist. Specialists are often selected by GPs based on familiarity, rather than expertise or the most suitable fee structure. There are still too many people finding out the cost of their treatment after it has occurred, which is totally unacceptable in other services, never mind when we're vulnerable as patients. This system has changed little in decades. But now the public now has more access to medical information than ever. Technology empowers consumers to have more say in their health care, so that they are at the center of health services, rather than clinicians. The rapid development of telemedicine, electronic health monitors, consumer portals and smartphone apps is delivering greater decision-making powers to the consumer. We need to ensure government and community support consumer-led initiatives in the design, delivery and self-management of health. That will mean many vulnerable people receiving support to navigate the system. The era of telemedicine needs to be embraced rather than viewed with distrust. We are increasingly living in a paperless society, but we still see patients having to lug around their test results from specialist to specialist because their health history is not available online. The government has committed funds to fix this but only a tiny proportion of doctors have signed up, and even a smaller number of patients have a comprehensive record of their treatment and tests. Fees for operations and treatments should be spelt out in advance, and ideally publicly available. Patients should be able to look up the performance of public and private hospitals and individual doctors and services. We don't have a health system in Australia: we have a sickness system that needs to be fundamentally reconfigured. We need to increase support for elements of the system that make people better and stop them from getting sick in the first place. This could include extra payments for GPs and companies who help people successfully achieve a healthy diet or more exercise. The results could be measured through the reduction of rates of diabetes, depression, obesity, stroke or cardiovascular disease in the community. Incentives could be given to people with chronic illness who manage their conditions so successfully they reduce their number of hospital stays or appointments. This is a very different world to the system that exists now, and the medical profession will need new skills to deal with patients who view themselves as equal partners in their health care. It’s not farfetched to imagine trainee doctors learning expanded and advanced skills in communication and partnerships alongside anatomy and biochemistry. 11. What does the author complain about the existing health care system?

A、It has been intentionally designed for health care providers.

B、It has been designed for service consumers.

C、It frustrates doctors and patients as well.

D、Technology serves customers in other businesses.

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第4题
The emergency exits are located in the following areas : _________.

A、front of the cabin

B、middle of the cabin

C、overhead bin

D、rear of the cabin

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第5题
In the context of managing performance in not for profit organisations, which of the following definitions is incorrect?

A、Value for money means providing a service in a way which is economical, efficient and effective.

B、Economy means doing things cheaply: not spending $2 when the same thing can be bought for $1.

C、Efficiency means doing things quickly: minimising the amount of time that is spent on a given activity.

D、Effectiveness means doing the right things: spending funds so as to achieve the organisation's objectives.

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第6题
There are two major parties in Britain today, the Conservative Party and the Labor Party, which have been in power by turns since 1945.The two—party system of Britain was formed in the course of the development of the capitalist state and the political parties. In order to strengthen the state machine, the British bourgeosie have let it come into being and exist in one form. or another form. since the 17th century. P.S. Tregidgo once said:“The more parties there are, the less likely it is that any one of them will be strong enough in Parliament to outvote all the others; but when there are only two, one of them is sure to have a majority of seats. This helps to ensure a strong and stable government.”This may be the reason why the British have the two party system.

The division into two parties grew out the establishment of a Protestant Church of England in the 16th century. Because of a purely religious difference of opinion, the Puritans were separated from the broad body of the Anglican Church. The non Puritan Anglicans were on the side of the King and Church, and their supporters were called by their opponents “Tories.”The Puritans were for Parliament and trade, and their supporters were called by the “Tories”“Whigs”. The Tories and the Whigs were in power by turns for a long time. In 1833,the Tory party split into two and its name was changed to Conservative. In the 1860s the Whigs became Liberals. From that time on, the Liberals and the Conservatives were in office by turns until 1922.The policies they put into effect were sometimes different, but they were both controlled by the rich.

The working class became more and more unwilling to follow the Conservatives and the Liberals. They wanted to have their own party. So the Labor party was formed by the trade unions. After 1922 the Labor Party gradually replaced the Liberal Party to become one of the two major parties in Great Britain.

C-25.What does “it” stand for in Para 1 with underline?

A、The two party system.

B、The state machine.

C、The Parliament.

D、The capitalist state.

C-26. We can learn from what P.S Tregidgo once said that ____.

A、if there are parties in Britain, none of them will be strong enough to have control in the government

B、the more patients there are, the more likely it is that they will have the decisive say in the government

C、the two party systems contributes to the establishment of a powerful and long lasting government

D、if there are only two parties in Britain, it will be easy for the government to control them

C-27. What can we infer from the forming of the Tory Party and the Whig Party?

A、These two parties originally believed in different religions.

B、These two parties were established under the influence of different religious believes.

C、The British King and the Parliament supported different religions because they were for the two party system.

D、The British King and the Parliament were supported by different parties for political reasons.

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第7题
In the 20th century fiction, Joseph Conrad’s ____ and E. M. Forster’s Passage to India represent colonial experience of the empire.

A、The Waste Land

B、Heart of Darkness

C、Sons and Lovers

D、Ulysses

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第8题
China's Economic Gain and Loss under the Epidemic.
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第9题
Artistically, Samuel Beckett has come under the strong influence of ______, whose works parody the unsympathetic world and man’s wretched lot.

A、Virginia Woolf

B、James Joyce

C、E.M. Foster

D、T.S. Eliot

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第10题
An announcement is needed when there is sales information in a department store
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