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Part IV TranslationAs the source of aluminum is almost inexhaustible, we can expect that more and more uses will be found for this versatile metal. (Passage Two)

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第1题

翻译:As the source of aluminum is almost inexhaustible, we can expect that more and more uses will be found for this versatile metal. (Passage Two)
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第2题

Ring groove inserts are occasionally used on aluminum alloy piston to_______.A.reduce the

Ring groove inserts are occasionally used on aluminum alloy piston to_______.

A.reduce the ring groove wear rate

B.seal against crankcase vapors

C.lessen the wear on aluminum part of the cylinder

D.allow for the greater expansion rate of aluminum

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第3题

In a two-stroke engine, the piston consists of a lower part, which is named as and usually
made of , and a upper part, which is referred to as and made of .

A.low-half, cast iron; top-half, heat-resistant steel

B.low-half, aluminum; top-half, stainless steel

C.piston skirt; cast iron; piston crown; heat-resistant steel

D.piston skirt; aluminum; piston crown; stainless steel

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第4题

Heading for Part IV ()
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第5题

Heading for Part IV (11): _____________________________________
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第6题

Studies show that having fun is a source of happiness, and is an important part of that pleasure.
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第7题

【填空题】In the decoding part, we use the formula ____________________ to take the source symbol.
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第8题

When aluminum was first produced about a hundred and fifty years ago, it was so difficult
to separate from the ores(矿石) in which it was found that its price was higher than that of gold. The price remained high until a new process was discovered for refining the metal with the aid of electricity approximately three quarters of a century later. The new method was so much cheaper that aluminum became practical for many purposes, one of which was making pots and pans.

Aluminum is lightweight, rustproof and easily shaped into different forms. By mixing it with other metals, scientist have been able to produce a variety of alloys, some of which have the strength of steel but weigh only one third as much.

Today, the uses of aluminum are innumerable. Perhaps its most important use is in transportation. Aluminum is found in the engines of automobiles, in the hulls of boats. It is also used in many parts of airplanes. In fact, the huge "airbus" planes would probably never have been produced if aluminum did not exist. By making vehicles lighter in weight aluminum has greatly reduced the amount of fuel needed to move them. Aluminum is also being used extensively in the building industry in some countries.

Since aluminum is such a versatile(多用的) metal, it is fortunate that bauxite(铝土矿) , which is one of its chief sources, is also one of the earth's most plentiful substances. As the source of aluminum is almost inexhaustible, we can expect that more and more uses will be found for this versatile metal.

The price of aluminum was sharply reduced when people discovered a new refining process with the aid of______.

A.wind power

B.solar energy

C.hydraulic power

D.electricity

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第9题

Eight percent of the Earth's crust is aluminum, and there are hundreds of aluminum-bearing
minerals and vast quantities of the rocks that contain them. The best aluminum ore is bauxite, defined as aggregates of aluminous minerals, more or less impure, in which aluminum is present as hydrated oxides. Bauxite is the richest of all those aluminous rocks that occur in large quantities, and it yields alumina, the intermediate product required for the production of aluminum. Alumina also occurs naturally as the mineral corundum, but corundum is not found in large deposits of high purity, and therefore it is an impractical source for making aluminum. Most of the many abundant nonbauxite aluminous minerals are silicates, and like all silicate minerals, they are refractory, resistant to analysis, and extremely difficult to process. The aluminum silicates are therefore generally unsuitable alternatives to bauxite because considerably more energy is required to extract alumina from them.

The intermediate product needed for the production of aluminum is______.

A.hydrated oxides

B.bauxite

C.alumina

D.silicates

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