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[主观题]

Aluminum as well as most metals _____.

A.is a good conductor B. is a good insulator

C. are good conductors D. are good insulators

答案

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发布时间：2020-09-07

更多“Aluminum as well as most metals _____.”相关的问题

第1题

听力原文：Man: Tell me about this new cleaner please. Can it be used to clean metal？Woman:

听力原文：Man: Tell me about this new cleaner please. Can it be used to clean metal？

Woman: Yes, on certain kinds. It's very good on aluminum and brass.

Man: Aluminum and brass. I see. What about other metals？ Can it be used with silver？

Woman: Well, it's not really very good with silver. We have a special cleaner for silver.

Man: Oh. And what about enamel surfaces, like on a bathtub, for example.

Woman: Yes, it works well on enamel.

Man: And what about on things like floor tiles？

Woman: Yes, it's perfect for floor tiles. It really takes off tough stains and marks. But it's not good for cleaning wooden floors or wooden surfaces. It might even damage them.

Man: How about plastic？

Woman: Plastic's fine. No trouble at all.

Man: Good, then I'll take two cans, please.

&8226;Look at the notes below.

&8226;You will hear a conversation about a new type of cleaner.

Cleaner Message

1．It's very good on aluminum and (9)______, but not very good with (10)______.

2．It works well on enamel, it's perfect for floor tiles. But it's not good for (11)______floors; however, (12)______is fine.

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第2题

听力原文：A: Tell me about this new cleaner please. Can it be used to clean metal？B: Yes, o

听力原文：A: Tell me about this new cleaner please. Can it be used to clean metal？

B: Yes, on certain kinds. It's very good on aluminum and brass.

A: Aluminum and brass. I see. What about other metals？ Can it be used with silver？

B: Well, it's not really very good with silver. We have a special cleaner for silver.

A: Oh. And what about enamel surfaces, like on a bathtub, for example.

B: Yes, it works weft on enamel.

A: And what about on things like floor tiles？

B: Yes, it's perfect for floor tiles. It really takes off tough stains and marks. But it's not good for cleaning wooden floors or wooden surfaces. It might even damage them.

A: How about plastic？

B: Plastic's fine. No trouble at all.

A: Good, then I'll take two cans, please.

？Look at the note below.

？You will hear a talk about a cleaner.

Cleaner Message

1 It's very good on aluminum and (9) , but not very good with (10)

2 It works well on enamel, it's perfect for floor tiles. But it's not good for (11) floors however, (12) is fine.

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第3题

It is very common for fireworks to contain aluminum, iron, steel, zinc or magnesium dust.A

It is very common for fireworks to contain aluminum, iron, steel, zinc or magnesium dust.

A．Y

B．N

C．NG

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第4题

Explain why aluminium（III )is the only stable oxidation state of aluminum in this compounds,in cont

Explain why aluminium(III )is the only stable oxidation state of aluminum in this compounds,in contrast to thallium,which has states of+1 and+3.

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第5题

Adair points out that his theory can't be applied to aluminum bats because ______.A．the "p

Adair points out that his theory can't be applied to aluminum bats because ______.

A．the "ping” sound is too vague for a fielder to catch

B．with the aluminum bats the batter always hits the ball stronger

C．they don' t produce different sounds of "crack" and "clunk"

D．the sounds they produce may interfere with the fielder's judgment

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第6题

The reinforced concrete construction with aluminum surface enhanced structural design and

reduced its costs.

A．Y

B．N

C．NG

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第7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8题

Technological influences have also crept into the lives of athletes. It's not just the lat

est drug on the market that they use; it's also the most up to date equipment. Innovations include: the use of the contemporary bicycle against the recumbent(斜卧式)bicycle, the texture of a golf ball to take full advantage of its traveling distance, the traditional wooden bat versus the new aluminum bat which is said to maximize one's athletic talent. Hockey has had changes. Perhaps one of the biggest changes of all was the mandate to wear a helmet. Today, the size and shape of pads, goalie equipment and even their sticks have been changed from wood to graphite(石墨). All of these efforts are in an attempt to "improve" the performance of athletes. Even figure skating(花样滑冰)is using technology to advance its skaters. There isn't just one brand of skate that skaters use. There are numerous different boots that all apply to what category of skating they do. For instance, a dancer and a single's skater would not have the same skate. Each boot and blade would be fit in order to maximize his or her performance. A single's skater's boot would be incredibly padded, sturdy and strong in order for them to land those powerful jumps. Yes, it is a safety issue as well, but this technology has led skating to the level it is at today.

All in all, it is quite hard to say whether we should be accepting these new technological advances or whether we should be sticking to the traditional model of sport. We are currently in the middle of both drug use and the use of new and innovative equipment as far as I can tell. Where are we going to progress from here？ Are athletes actually going to put microchips in their brain in order to attain an athletic title？ The future holds many options for the outlook of sport, and it will be interesting to address tradition in sport in the years to come.

What the author discussed in the previous sections is most probably about ______.

A．various performance-improving drugs

B．the development of modern technology

C．innovative equipment in the sports field

D．technological influences on other people

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第9题

Now elsewhere in the world, Iceland may be spoken of, somewhat breathlessly, as western Eu

rope's last pristine wildness. But the environmental awareness that is sweeping the world had bypassed the majority of Icelanders. Certainly they were connected to their land, the way one is complicatedly connected to, or encumbered by, family one can't do anything about. But the truth is, once you're off the beaten paths of the low-lying coastal areas where everyone lives, the roads are few, and they're all bad, so Iceland's natural wonders have been out of reach and unknown even to its own inhabitants. For them the land has always just been there, something that had to be dealt with and, if possible, exploited—the mind-set being one of land as commodity rather than land as, well, priceless art on the scale of the " Mona Lisa".

When the opportunity arose in 2003 for the national power company to enter into a 40-year contract with the American aluminum company Alcoa to supply hydroelectric power for a new smelter （冶炼厂）, those who had been dreaming of something like this for decades jumped at it and never looked back. Iceland may at the moment be one of the world's richest countries, with a 99 percent literacy rate and long life expectancy. But the project's advocates, some of them getting on in years, were more emotionally attuned to be the country's century upon century of want, hardship, and colonial servitude to Denmark, which officially ended only in 1944 and whose psychological imprint remained relatively fresh. For the longest time, life here had meant little more than a hut, dark all winter, cold, no hope, children dying left and right, earthquakes, plagues, starvation, volcanoes erupting and destroying all vegetation and livestock, all spirit— a world revolving almost entirely around the welfare of one's sheep and, later, on how good the cod catch was. In the outlying regions, it still largely does.

Ostensibly, the Alcoa project was intended to save one of these dying regions— the remote and sparsely populated east— where the way of life had steadily declined to a point of desperation and gloom. After fishing quotas were imposed in the early 1980s to protect fish stocks, many individual boat owners sold their allotments or gave them away, fishing rights ended up mostly in the hands of a few companies and small fishermen were virtually wiped out. Technological advances drained away even more jobs previously done by human hands, and the people were seeing everything they had worked for all their lives turn up worthless and their children move away. With the old way of life doomed, aluminum projects like this one had come to be perceived, wisely or not, as a last chance. "Smelter or death."

The contract with Alcoa would infuse the region with foreign capital, an estimated 400 jobs, and spin-off service industries. It also was a way for Iceland to develop expertise that potentially could be sold to the rest of the world; diversify an economy historically dependent on fish; and, in an appealing display of Icelandic can-do verse, perhaps even protect all of Iceland, once and for all, from the unpredictability of life itself.

" We have to live," Halldor Asgrimsson said. Halldor, a former prime minister and longtime member of parliament from the region, was a driving force behind the project. "We have a right to live. "

According to the passage, most Icelanders view land as something of______.

A．environmental value

B．commercial value

C．potential value for tourism

D．great value for livelihood

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第10题

An attempt to improve the performance of athletes is the use of ______.A．a graphite ballB．

An attempt to improve the performance of athletes is the use of ______.

A．a graphite ball

B．an aluminum bat

C．a textile golf ball