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A3XX will fly faster while consuming less oil.A．RightB．WrongC．Not mentioned

A3XX will fly faster while consuming less oil.

A．Right

B．Wrong

C．Not mentioned

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更多“A3XX will fly faster while con…”相关的问题

第1题

A3XX will fly faster while consuming less oil.

A3XX will fly faster while consuming less oil.请帮忙给

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第2题

A3XX will fly faster while consuming less oil. A．RightB．WrongC．Not mentioned

A3XX will fly faster while consuming less oil.

A．Right

B．Wrong

C．Not mentioned

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第3题

A3 × × will fly faster while consuming less oil. 查看

材料

A.Right

B.Wrong

C.Not mentioned

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第4题

A．A space rocket can only be used once.B．The pilot can fly a space plane just like an o

A．A space rocket can only be used once.

B．The pilot can fly a space plane just like an ordinary plane.

C．A space rocket travels much faster than a space plane.

D．Both A and B.

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第5题

Which of the following is an example of inertia？A．A boat can stay on water.B．A plane can f

Which of the following is an example of inertia？

A．A boat can stay on water.

B．A plane can fly in the air.

C．You can walk faster on a very smooth surface.

D．You can go forward and backward on a swing.

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第6题

Boeing Co's Sonic Cruiser, a proposed faster airliner, would be mostly blended material, p

rogram director Walt Gillette said recently. In its quest for the 【21】______ to fly 15 to 20 per cent faster than 【22】______ airliners, the US company says about 60 per cent of the new plane's 【23】______ , including the wing, would be a carbon-fiber-reinforced composite material that is lighter than aluminum for the same 【24】______ . "Composites would 【25】______ almost all of the airplane that you could see from the outside," Gillette said. Composites are well regarded among aeronautical engineers and have been in 【26】______ use since the 1970s. Each generation of planes has more composites, and Gillette 【27】______ that about 10 per cent of Boeing's 【28】______ civil aircraft, the early-1990s 777, is built 【29】______ the material. 【30】______ still only a proposal, the Sonic Cruiser has 【31】______ the interest of many airlines, which expressed unusual enthusiasm for the aircraft 【32】______ the September 11 attacks forced most of them to scale back operations. When Boeing 【33】______ the Sonic Cruiser last year it said the plane might enter service 【34】______ 2006 and 2008. Gillette said the 【35】______ date now is 2008, by which time the market and technology are expected to have developed 【36】______ Wind-tunnel tests 【37】______ the company's computer calculations of optimal cruising speed for the plane at 95 to 98 per. cent of the speed of sound. Going faster than sound would use too much fuel and 【38】______ great 【39】______ on the aircraft's engines. Gillette said the Sonic Cruiser 【40】______ be offered as a family of aircraft with 200 to 250 seats and a range of 6,500 to 9,000 nautical miles (12,000 to 16,700 kilometers).

【21】

A．proficiency

B．efficiency

C．affection

D．effective

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第7题

听力原文： Although I think the United States generally has an excellent system of transpor

tation, I do not think that it does a good job of transporting people between cities that are only a few hundred miles apart. A person commuting between Detroit and Chicago, or between San Francisco and Los Angeles may spend only a relatively short time in the air, while spending several hours getting to and from the airport. This situation makes flying almost as time-consuming as driving. Moreover, airplanes use a lot of their fuel just getting into the air. They simply are not fu- el effective on short trips.

High speed trains may be an answer. One fairly new proposal for such trains is for some- thing called a Maglev, meaning a magnetically levitated train. Maglev will not actually ride on the tracks, but will fly above tracks that are magnetically activated. This will save wear and tear on the tracks. These trains will be able to go faster than 150 miles per hour. At this speed, conventional trains have trouble staying on the tracks.

As you can see, Maglev offers exciting possibilities for the future.

What is the main topic of the talk？

A．Energy conversation.

B．Transportation of the future.

C．Transportation problem.

D．Advantages of air transportation over railroad.

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第8题

听力原文：Although I think the United States generally has an excellent system of transport

听力原文： Although I think the United States generally has an excellent system of transportation, I do not think that it does a good job of transporting people between cities that are only a few hundred miles apart. A person commuting between Detroit and Chicago, or between San Francisco and Los Angeles, so-called "strip-cities", may spend only a relatively short time in the air while spending several hours getting to and from the airport. This situation makes flying almost as time-consuming as driving. Moreover, airplanes use a lot of their fuel just getting into the air. They are simply not fuel-efficient on short trips. High-speed trains may be an answer. One fairly new proposal for such a train is for something called "mag-lev", meaning a magnetically levitated train. Mag-levs will not actually ride on the track, but will fly above the track that is magnetically activated. This will save wear and tear on the track. These trains will be able to go faster than 150 miles per hours. At that speed, conventional trains have trouble staying on the track. As you can see, mag-levs offer exciting possibilities for the future.

(20)

A．Strip-cities.

B．Transportation of the future.

C．Energy conservation.

D．Advantages of air transportation over railroads.

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第9题

The first A3XX will be available in 2003.A．RightB．WrongC．Not mentioned

The first A3XX will be available in 2003.

A．Right

B．Wrong

C．Not mentioned