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提问人:网友jellyku 发布时间:2022-01-06
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When adding oil to a refrigeration system, precautions must be taken to ensure thatA.the c

When adding oil to a refrigeration system, precautions must be taken to ensure that

A.the compressor suction pressure is not too high

B.all air is purged from the pump and charging fittings

C.the high pressure cutout switch is held open to prevent accidental starting

D.the condenser is completely shutdown first

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更多“When adding oil to a refrigeration system, precautions must be taken to ensure thatA.the c”相关的问题
第1题
Egg yolk contains lecithin which acts a an emulsifier. It can be used to stabilize emulsions. Adding egg yolk to a mixture of oil and water prevents the two liquids from separating.
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第2题
If you are given the job of adding hydraulic fluid to a mooring winch, and are not certain
as to the type of fluid to use, you should _____.

A.add fluid that is the same color as the fluid in the reservoir

B.add turbine oil because it is always a good substitute

C.add any oil that has the same viscosity as the hydraulic fluid

D.check the winch manufacturers instruction book

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第3题
Judging by the $23 billion it earned last year, these should be the best of times for Shel
l, the Anglo-Dutch energy giant that ranks third among the top five Western oil companies. But Wall Street isn't celebrating. Instead, analysts are worried that buried beneath the record profit figures are worrying signs of a business in decline.

That's because Shell hasn't been able to find nearly as much oil and gas as it's now pumping out of the ground. In fact, it hasn't even come close—replacing only 60% to 70% of what it produced in 2005 and only 19% in 2004. Shell has had reserve problems for years—a controversy over improperly booked assets forced it to reduce estimated reserves by roughly 30% and led to the resignation of its CEO, Phil Watts, in 2004. But what's troubling now is that Shell is falling way behind rivals like Exxon and BP despite spending billions more each year on exploring and drilling new wells. Last year Exxon replaced 112% of production; BP came up with 95%. "I have never seen anything like this," says Fadel Gheit, a veteran energy analyst with Oppenheimer & Co. "Shell used to represent the gold standard in this industry, but lately they can't get their act together."

To be sure, Shell still has huge assets—nearly 12 billion barrels. But in the oil and gas industry, reserve replacement is the best guide to whether a company will be able to maintain-or grow-production in the future. So not replacing what you pump, says longtime industry observer Matthew Simmons, "is like eating your seed corn. If you're not finding new oil, you're just liquidating what you've got." Indeed, Shell's daily production figures have been weak lately, falling 6.7 % in 2005, to 3.52 million barrels a day.

Privately, Shell execs say the company's decision to cut spending for exploration when oil prices bottomed out in the late 1990s is partly to blame for the anemic numbers now. Shell CEO Jeroen Vander Veer insists that projects like those on Sakhalin Island off Siberia and in Nigeria and the Gulf of Mexico will enable the company to start catching up with peers in the years ahead. It won't be easy. "If you're not adding to reserves, you have a problem," says Sanford Bernstein analyst Oswald Clint. "Shell will have to run twice as hard just to stay in place."

According to the passage, the decline of Shell

A.is a hidden process.

B.is caused by the profit last year.

C.is the estimation of Wall Street.

D.is the fault of the CEO.

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第4题
According to the author, which of the following is not among the causes that lead to the f
ailure of some key oil-producing countries to boost their oil output capacity?

A.The US has imposed sanctions on Iran, Iraq, Sudan, Libya, and Burma (Myanmar).

B.The US at times helped both sides militarily in the 1980-88 war between Iran and Iraq.

C.The United States forced several oil-exporting nations to stop adding to their capacity to produce more oil.

D.The war between Iran and Iraq "drained the financial resources of the whole area."

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第5题
Many A decade ago, at a time when plaices like Ivory Coast and Equatorial Guinea were bein
g largely ignored by the petroleum world majors in favor of proven mega-sources like Nigeria and Angola--and when their drilling sites could thus be leased for a relative song--Joe Bruso helped put these states back on the map. Bruso was part of a small team working for United Meridian Corp. (later acquired by Ocean Energy) that helped discover and develop the big Zafiro field off Equatorial Guinea. The impact for that country of half a million people, Bruso said in a phone interview from Houston, "has been extraordinary", it was not uninteresting for United Meridian either. Meantime, Ivory Coast, where Bruso and his partner, Coy H. Squyres, discovered the Panthere gas condensate and Lion oil fields, went within a few years from being a net energy importer to a net exporter, and from being an overlooked bit of West African real estate to a place where "you just can't get acreage" for drilling.

Those findings, facilitated by the use of exploration data left behind by the majors, were made on a $1 million annual budget over just four years. The huge returns on a relatively small layout sparked a kind of offshore land rush.

While the impact of such finds has been uneven--some of West Africa's poor say they have seen little of the new wealth oil and gas are expected to flow for years in ways that are making this one of the World's more significant producer regions. Hundreds of sites remain to be explored. "It's amazing the leap to prosperity that the whole place has made," Bruso said of Equatorial Guinea. He is now president of Sovereign Oil Gas, a small Houston-based firm.

American boosters say African oil can help lessen U.S. dependence on Middle Eastern oil. Indeed, a group representing the industry and its backers in Congress and government have called for the Gulf of Guinea to be declared of vital strategic interest. Its waters border Cameroon, Congo, Gabon, Equatorial Guinea and Nigeria. West Africa, led by Nigeria and then Angola and Gabon, now supplies the United States with roughly 15 percent of its oil, but that figure is expected to reach 25 percent over the next decade. West African crude oil tends to be of good quality, selling just below the Brent benchmark. It can reach refineries in the Gulf of Mexico in just 20 days, half the time required from the Middle East, at savings of 35 cents per barrel, according to Petroleum Intelligence Weekly.

Representative William Jefferson, Democrat of Louisiana, has called for a "full-fledged makeover of the U.S. strategic relationship with Africa to take advantage of its petroleum potential. "The United States stands to benefit by having a stable, abundant and relatively inexpensive source of high-quality oil; Africa benefits in that it will receive billions of dollars in badly needed investment and government revenue," he said. "It is a classic win-win situation." West African oil production is now about 3.5 million barrels per day, said Michael Rodgers, senior director of upstream services at PFC Energy in Washington.

West African reserves are forecast to reach 40 billion barrels by 2010, according to Petroleum Intelligence Weekly. All this, Rodgers said, is not going to lead to a new Middle East-size source of oil for the West. His own estimate of total African reserves of 80 billion barrels is a fraction of the 650 billion to 700 billion barrels in the Middle East. Still, he said, it will diminish "the importance of the Middle East".

For Bruso, the development of West African oil is far from complete. A spate of "billion-barrel discoveries" in Nigeria and Angola are yet to be developed, he said, adding that there are seven big sites in development, each likely to produce around 250 million barrels a day. "That's a huge new volume that will be hitting the market starting between 2004 and 2007," h

A.New finds in West Africa set off an offshore land rush.

B.Bruso helped the development of West African oil.

C.Full-fledged makeover of the U.S. strategic relationship with Africa is badly needed.

D.West Africa's petroleum potential: a classic win-win situation.

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第6题
Steel is valued for its reliability, but not when it gets cold. Most forms of steel __26

__ become brittle (脆的)at temperatures below about -25℃ unless they are mixed with other metals. Now, though, a novel type of steel has been developed that resists __27__ at much lower temperatures, while retaining its strength and toughness—without the need for expensive __28__.

Steel's fragility at low temperatures first became a major concern during the Second World War. After German U-boats torpedoed (用鱼雷攻击)numerous British ships, a 2,700-strong fleet of cheap- and-cheerful "Liberty ships" was introduced to replace the lost vessels, providing a lifeline for the __29__ British. But the steel shells of hundreds of the ships __30__ in the icy north Atlantic, and 12 broke in half and sank.

Brittleness remains a problem when building steel structures in cold conditions, such as oil rigs in the Arctic. So scientists have __31__ to find a solution by mixing it with expensive metals such as nickel.

Yuuji Kimura and colleagues in Japan tried a more physical __32__. Rather than adding other metals, they developed a complex mechanical process involving repeated heating and very severe mechanical deformation, known as tempforming.

The resulting steel appears to achieve a combination of strength and toughness that is __33__ to that of modem steels that are very rich in alloy content and, therefore, very expensive.

Kimura's team intends to use its tempformed steel to make ultra-high strength parts, such as bolts. They hope to reduce both the number of __34__ needed in a construction job and their weight—by replacing solid supports with __35__ tubes, for example. This could reduce the amount of steel needed to make everything from automobiles to buildings and bridges.

A)abruptly

B)additives

C)approach

D)ardently

E)besieged

F)channel

G)comparable

H)components

I)cracked

J)fractures

K)hollow

L)relevant

M)reshuffled

N)strived

O)violent

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第7题
Try to figure out what displacement is desired when adding unit virtual loads like this. Try to figure out what displacement is desired whe
Try to figure out what displacement is desired when adding unit virtual loads like this.Try to figure out what displacement is desired whe
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第8题
Many A decade ago, at a time when places like Ivory Coast and Equatorial Guinea were being
largely ignored by the petroleum world majors in favor of proven mega-sources like Nigeria and Angola—and when their drilling sites could thus be leased for a relative song—Joe Bruso helped put these states back on the map. Bruso was part of a small team working for United Meridian Corp. (later acquired by Ocean Energy) that helped discover and develop the big Zafiro field off Equatorial Guinea. The impact for that country of half a million people, Bruso said in a phone interview from Houston, "has been extraordinary", it was not uninteresting for United Meridian either. Meantime, Ivory Coast, where Bruso and his partner, Coy H. Squyres, discovered the Panthere gas condensate and Lion oil fields, went within a few years from being a net energy importer to a net exporter, and from being an overlooked bit of West African real estate to a place where "you just can't get acreage" for drilling.

Those findings, facilitated by the use of exploration data left behind by the majors, were made on a $1 million annual budget over just four years. The huge returns on a relatively small layout sparked a kind of offshore land rush.

While the impact of such finds has been uneven—some of West Africa's poor say they have seen little of the new wealth—oil and gas are expected to flow for years in ways that are making this one of the world's more significant producer regions. Hundreds of sites remain to be explored. "It's amazing the leap to prosperity that the whole place has made," Bruso said of Equatorial Guinea. He is now president of Sovereign Oil Gas, a small Houston-based firm.

American boosters say African oil can help lessen U.S. dependence on Middle Eastern oil. Indeed, a group representing the industry and its backers in Congress and government have called for the Gulf of Guinea to be declared of vital strategic interest. Its waters border Cameroon, Congo, Gabon, Equatorial Guinea and Nigeria. West Africa, led by Nigeria and then Angola and Gabon, now supplies the United States with roughly 15 percent of its oil, but that figure is expected to reach 25 percent over the next decade. West African crude oil tends to be of good quality, selling just below the Brent benchmark. It can reach refineries in the Gulf of Mexico in just 20 days, half the time required from the Middle East, at savings of 35 cents per barrel, according to Petroleum Intelligence Weekly.

Representative William Jefferson, Democrat of Louisiana, has called for a "full-fledged makeover of the U.S. strategic relationship with Africa" to take advantage of its petroleum potential. "The United States stands to benefit by having a stable, abundant and relatively inexpensive source of high-quality oil; Africa benefits in that it will receive billions of dollars in badly needed investment and government revenue," he said. "It is a classic win-win situation." West African oil production is now about 3.5 million barrels per day, said Michael Rodgers, senior director of upstream services at PFC Energy in Washington.

West African reserves are forecast to reach 40 billion barrels by 2010, according to Petroleum Intelligence Weekly. All this, Rodgers said, is not going to lead to a new Middle East-size source of oil for the West. His own estimate of total African reserves of 80 billion barrels is a fraction of the 650 billion to 700 billion barrels in the Middle East. Still, he said, it will diminish "the importance of the Middle East".

For Bruso, the development of West African oil is far from complete. A spate of" billion-barrel discoveries" in Nigeria and Angola are yet to be developed, he said, adding that there are seven big sites in development, each likely to produce around 250 million barrels a day. "That's a huge new volume that will be hitting the market starting between 2004 and 2007," he said.

Which of t

A.New finds in West Africa set off an offshore land rush.

B.Bruso helped the development of West African oil.

C.Full-fledged makeover of the U.S. strategic relationship with Africa is badly needed.

D.West Africa' s petroleum potential: a classic win-win situation.

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第9题
"In the past we were a lonely car maker, but we had good business," says Bernd Engelstadte
r, technical executive director at Shanghai Volkswagen, adding to he arrived in China seven years ago "competition was not a problem".

A.that

B.when

C.that when

D.when that

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