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提问人:网友hhhh7125 发布时间:2022-01-07
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If you have never seen a power plant, you might find it hard to imagine how enormously com

plex the equipment is or how much heat is generated by the boilers or how much coal it takes to fuel the furnaces for just one day.

During the course of a day, the boilers at one of our power plants, Morgantown, for example, can turn 24 million gallons of water into steam. That generating plant alone uses 9,900 tons of coal in its furnaces in just one day. Potomac Electric Power Company (PEPCO) uses so much coal that we have purchased two 80-car unit trains to facilitate the delivery process. And Morgantown alone can produce over 25 million kilowatthours of electricity in a single day's operation.

Electricity is produced by spinning large magnets inside a coil of wire within the generator. The faster we spin the magnets, the higher will be the voltage of the electricity produced. Electricity leaves a PEPCO generator at between 13,800 and 24,000 volts.

The next step in the process occurs when electricity passes through a transformer where the voltage is stepped up to continue on its journey. A transmission wire is like a small diameter pipe. Stepping up the voltage is like increasing water pressure, thus speeding the flow of energy through the system.

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更多“If you have never seen a power plant, you might find it hard to imagine how enormously com”相关的问题
第1题
听力原文:If you judge by the number of people who go to see the games and by the number of

听力原文: If you judge by the number of people who go to see the games and by the number of those who actually play it, basketball is probably the most popular sport in the United States. It is mainly an indoor game, and the seasons extends from late fall, through the winter, to early spring. There are many professional teams, but for the most part basketball is a second sport. There is hardly a high school or college in the country that does not have its team and its loyal following of fans.

In spring and summer, the most popular sport is baseball. During the warm weather you can see young men and boys playing this game in any part of the country. Radio and television bring the details of the big games to every comer of the land, and the activities of the professional teams are a topic of conversation for Americans everywhere.

In the fall, the most popular sport is football. As you know, this is not the same kind of game that is se popular in other parts of the world. Like basketball and baseball, it is typically American, and those who have never seen it before have difficulty seeing any sense in it. But for most of the spectators, the game itself is not as important as the music, the cheering, and the festival spirit that go with it. On a cool, bright autumn afternoon, there is nothing so colorful and exciting as a football game.

(33)

A.Sports in the United States.

B.The most popular sports in the United Sports.

C.Three popular sports in the United States.

D.Sports and United States.

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第2题
You'd better not push yourself too hard, or you’ll get sick. ---- ()

A.You’re right.

B.Let me se

C.Never min

D.I'mnotafraidso

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第3题
One day a lawyer's (律师) wife fell iii and he went to get a doctor. The doctor went to se

One day a lawyer's (律师) wife fell iii and he went to get a doctor. The doctor went to see tile woman, but before he went into the house he stopped. He knew that the lawyer never paid his bill (账单). So he said to the man, "But if I do cure (治愈) your wife I'm afraid you may not pay me."

"Sir," said the lawyer, '" here I have $ 500. Whether you cure my wife or whether you kill her I will give you all this."

The doctor was now sure of the payment and went into the house. When he reached the woman's bedside, it was soon clear to him that he could do little. She was badly iii, and though he gave her some medicine to take, she soon died.

He told the lawyer he was very sorry, then asked for the money.

"Did you kill my wife.'?" asked the lawyer.

"Of course not," said the doctor.

"Well, did you cure my wife?" asked the lawyer.

"I'm afraid that was impossible," answered the doctor.

"Well then, since you didn't kill her and you didn't cure her, I have nothing to pay you."

Before the doctor went into the lawyer's house he stopped because ______.

A.the lawyer was too poor to pay his bills

B.the lawyer had a bad name

C.he knew, well he couldn't cure the lawyer's wife

D.it was well-known that the lawyer would not be willing to pay what he should

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第4题
The witness told the court that he ______ the accused before.A.had ever seenB.had never se

The witness told the court that he ______ the accused before.

A.had ever seen

B.had never seen

C.hadn't ever been seeing

D.didn't have ever seen

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第5题
听力原文:M: How do you like your neighbours?F: The old man looks serious and I've never se

听力原文:M: How do you like your neighbours?

F: The old man looks serious and I've never seen him smile. The old lady is very kind.

Why does the woman think the old man looks serious?

A.He's kind to us.

B.She often helps us.

C.He never smiles to us.

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第6题
You ______ the look on his face when he won the prize.A、would have seenB、should have se

You ______ the look on his face when he won the prize.

A、would have seen

B、should have seen

C、must see

D、can be seeing

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第7题
Databases are everywhere, but you have never seen them.()
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第8题
We have extended our gu______ to five years and you never pay extra for that!
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第9题
Writing can ______ your world by the way to make you communicate effectively with people you have ne
ver met. (broad)
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第10题
-Have you been to America?-I've never been there but I hope to go there in the futur

-Have you been to America?

-I've never been there but I hope to go there in the future.

A. Right

B. Wrong

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第11题
By the time you get to Greenwich you ______ the most historic parts of London.A.will be se

By the time you get to Greenwich you ______ the most historic parts of London.

A.will be seeing

B.will see

C.are going to see

D.will have seen

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