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更多“How many crystal systems are there？ How many patterns can atoms form with these crystal systems？ Wha”相关的问题
第1题
How many visitors had been to the Crystal Palace altogether？
A．6,000.00
B．60,000.00
C．6,000,000.00
第2题
听力原文： I wonder how many of you would want to work in a tall building such as the Empire State Building if you had to climb 102 flights of stairs to reach the top. Not many, I imagine. If it were not for the invention of elevators, or lifts, tall buildings would be unusable.
The first lift was just a box suspended on a rope. Using a series of pulleys, a group of oxen or strong men would pull the rope and lift the box to a higher point. Lifts were used only for heavy materials, not passengers. Even in the nineteenth century, when steam power was used to operate the lifts, people didn' t ride them. They didn' t trust the rope that held the Box.
In 1853, Elisha G. Otis invented the first safe lift. He showed his invention in New York at the Crystal Palace Exhibition. At the exhibition, Otis was pulled up in an open box that was attached to two guide rails. When he was lifted far above the spectators, he gave the order to cut the rope. To the amazement of the crowd, the lift did not fall straight downward to the floor. Instead, it was held fast to the guide mils by a certain device. He had built powerful metal clamps on the carriage as a safety measure. The demonstration worked, end people have been riding as passengers in elevators ever since.
(30)
A．Disadvantages of tall buildings.
B．Modern elevators.
C．The Crystal Palace Exhibition.
D．The invention of the elevator.
第3题
The first lift was just a box suspended on a rope. Using a series of pulleys, a group of oxen ox strong men would pull the rope end lift the box to a higher point. Lifts were used only for heavy materials, not passengers. Even in the nineteenth century, when steam power was used to operate the lifts, people didn't ride them. They didn't trust the rope that held the box.
In 1853, Elisha G. Otis invented the first safe lift. He showed his invention in New York at the Crystal Palace Exhibition. At the exhibition, Otis was pulled up in an open box that was attached to two guide mils. When he was lifted far above the spectators, he gave the order to cat the rope. To the amazement of the crowd, the lift did not fall straight downward to the floor. Instead, it was held fast to the guide rails by a certain device. He had built powerful metal clamps on the carriage as a safety measure. The demonstration worked, and people have been riding as passengers in elevators ever since.
(30)
A．Disadvantages of tall buildings.
B．The Crystal Palace Exhibition.
C．Modem elevators.
D．The invention of the elevator.
第4题
The first lift was just a box suspended on a rope. Using a series of pulleys, a group of oxen ox strong men would pull the rope end lift the box to a higher point. Lifts were used only for heavy materials, not passengers. Even in the nineteenth century, when steam power was used to operate the lifts, people didn't ride them. They didn't trust the rope that held the box.
In 1853, Elisha G. Otis invented the first safe lift. He showed his invention in New York at the Crystal Palace Exhibition. At the exhibition, Otis was pulled up in an open box that was attached to two guide mils. When he was lifted far above the spectators, he gave the order to cat the rope. To the amazement of the crowd, the lift did not fall straight downward to the floor. Instead, it was held fast to the guide rails by a certain device. He had built powerful metal clamps on the carriage as a safety measure. The demonstration worked, and people have been riding as passengers in elevators ever since.
(26)
A．Disadvantages of tall buildings.
B．Modem elevators.
C．The Crystal Palace Exhibition.
D．The invention of the elevator.
第5题
Crystal Ear
One day a friend asked my wife Jill if I wanted a heating aid. "He certainly does. "replied Jill. After heating about a remarkable new product. Jill finally got up the nerve to ask me if I'd ever thought about getting a heating aid. "No way," I said. "It would make me look 20 years older." "No, no," she replied. "This is entirely different. It's Crystal Ear!"
Jill was right. Crystal Ear is different--not the old-styled body worn or over-the-ear aid, but all advanced personal sound system so small that it's like contacts(隐形眼镜) for your ears. And Crystal Ear is super-sensitive and powerful, too. You will hear sounds your ears have been missing for years. Crystal Ear will make speech louder, and the sound is pure and natural.
I couldn't believe how tiny it is. It is smaller than the tip of my little finger and it's almost invisible when worn. There are no wires, no behind-the-ear device. Put it in your ear and its ready-to-wear mold(形状) fits comfortably. Since it's not too loud or too tight, you may even forget that you're wearing it! Use it at work or at play. And if your hearing problem is worse in certain situations, use Crystal Ear only when you need it.
Heating loss, which occurs typically prior to teenage years, progresses throughout one's lifetime. Although hearing loss is now the world's number one health problem, nearly 90 percent of people suffering heating loss choose to leave the problem untreated. For many millions, treating hearing loss in a conventional way can involve numerous office visits, expensive testing and adjustments to fit your ear. Thanks to Crystal Ear, the "sound solution" is now convenient. Almost 90 percent of people with mild hearing loss, and millions more with just a little hearing drop-off (下降), can be dramatically helped with Crystal Ear. Moreover, its superior design is energy-efficient, so batteries can last months. Crystal Ear is now available to help these people treat their heating loss with a small hearing amplifier (放大器).
Initially the writer did not want to buy a hearing aid because ______.
A．it would make him look old
B．it would make him nervous
C．it was too expensive
D．it was old-styled
第6题
Crystal Ear
One day a friend asked my wife Jill if I wanted a hearing aiD．"He certainly does," replied Jill. After hearing about a remarkable new product, Jill finally got up the nerve to ask me if I'd ever thought about getting a hearing aiD．"No way," I saiD．"It would make me look 20 years older.""No, no," she replieD．"This is entirely different. It's Crystal Ear!"
Jill was right. Crystal Ear is different-not the old-styled body worn or over-the-ear aid, but an advanced personal sound system so small that it's like contacts (隐形眼镜) for your ears. And Crystal Ear is super-sensitive and powerful, too. You will hear sounds your ears have been missing for years. Crystal Ear will make speech louder, and the sound is pure and natural.
I couldn't believe how tiny it is. It is smaller than the tip of my little finger and it's almost invisible when worn. There are no wires, no behind-the-ear device. Put it in your ear and its ready-to-wear mold (形状) fits comfortably. Since it's not too loud or too tight, you may even forget that you're wearing it! Use it at work or at play. And if your hearing problem is worse in certain situations, use Crystal Ear only when you need it.
Hearing loss, which occurs typically prior to teenage years, progresses throughout one's lifetime. Although hearing loss is now the world's number one health problem, nearly 90 percent of people suffering hearing loss choose to leave the problem untreateD．For many millions, treating hearing loss in a conventional way can involve numerous office visits, expensive testing and adjustments to fit your ear. Thanks to Crystal Ear, the "sound solution" is now convenient. Almost 90 percent of people with mild hearing loss, and millions more with just a little hearing drop-off (下降), can be dramatically helped with Crystal Ear. Moreover, its superior design is energy-efficient, so batteries can last months. Crystal Ear is now available to help these people treat their hearing loss with a small hearing amplifier (放大器).
第 36 题 Initially the writer did not want to buy a hearing aid because
A．it would make him look old.
B．it would make him nervous.
C．it was too expensive.
D．it was old-styled.
第7题
Crystal Ear
One day a friend asked my wife Jill if I wanted a hearing aid. "He certainly does," replied Jill. After hearing about a remarkable new product, Jill finally got up the nerve to ask me if I'd ever thought about getting a hearing aid. "No way," I said. "It would make me look 20 years older." "No, no," she replied. "This is entirely different. It's Crystal Ear!"
Jill was right. Crystal Ear is different—not the old-styled body worn or over-the-ear aid, but an advanced personal sound system so small that it's like contacts (隐形眼镜) for your ears. And Crystal Ear is super-sensitive and powerful, too. You will hear sounds your ears have been missing for years. Crystal Ear will make speech louder, and the sound is pure and natural.
I couldn't believe how tiny it is. It is smaller than the tip of my little finger and it's almost invisible when worn. There are no wires, no behind-the-ear device. Put it in your ear and its ready-to-wear mold (形状) fits comfortably. Since it's not too loud or too tight, you may even forget that you're wearing it! Use it at work or at play. And if your hearing problem is worse in certain situations, use Crystal Ear only when you need it.
Hearing loss, which occurs typically prior to teenage years, progresses throughout one's lifetime. Although hearing loss is now the world's number one health problem, nearly 90 percent of people suffering hearing loss choose to leave the problem untreated. For many millions, treating hearing loss in a conventional way can involve numerous office visits, expensive testing and adjustments to fit your ear. Thanks to Crystal Ear, the "sound solution" is now convenient. Almost 90 percent of people with mild hearing loss, and millions more with just a little hearing drop-off (下降), can be dramatically helped with Crystal Ear. Moreover, its superior design is energy-efficient, so batteries can last months. Crystal Ear is now available to help these people treat their hearing loss with a small hearing amplifier (放大器).
Initially the writer did not want to buy a hearing aid because
A．it would make him look old.
B．it would make him nervous.
C．it was too expensive.
D．it was old-styled.
第8题
根据下列文章,请回答 31～35 题。
Crystal Ear
One day a friend asked my wife Jill if lwanted a hearing aid．“He certainly does．” replied Jill．After hearing about aremarkable new product，Jill finally got up the nerve to ask me if I'd everthought about getting a hearing aid．“No way,” I said。“It would make me look 2oyears older．”“No，no，”she replied．“This is entirely different．It's Crystal Ear!”
Jill was right．Crystal Ear isdifferent--not the old．styled body worn or over-the．Ear aid，but an advancedpersonal sound system SO small that it's like contacts(隐形眼镜)for your ears．AndCrystal Ear is super-sensitive and powerful，too．You will hear sounds your earshave been missing for years．Crystal Ear will make speech Louder and the soundis pure and natural．
I couldn't believe how tiny it is．It issmaller than the tip of my little finger and it's almost invisible when worn．Thereare no wires，no behind-the-ear device．Put it in your ear and its ready-to-wearmold(形状)讯s comfortably．Since it's not too‘loud or too tight， you may evenforget that you're wearing it! Use it at work or at play．And if your hearing problemis worse in certain situations，use Crystal Ear only when you need it．
Hearing loss。which occurs typically prior toteenage years，progresses throughout one's lifetime．Although hearing loss is nowthe world's number one health problem，nearly 9o percent of people suffering hearingloss choose to leave the problem untreated。For many millions，treating hearingloss in a conventional way can involve numerous office visits，expensive testingand adjustments to fit your ear．Thanks to Crystal Ear，the “sound solution” isnow convenient．Almost 9o percent of people with mild hearing loss．and millionsmore with just a little hearing drop—off(下降)，can be dramatically helped with CrystalEar．Moreover, its superior design is enemy—efficient。SO batteries can lastmonths．Crystal Ear is now available to help these people treat their hearingloss with a small hearing amplifier(放大器)．
第 31 题 Initially the writer did not want to buy ahearing aid because
A．it would make him look old．
B．it would make him nervous．
C．it was too expensive．
D．it was old—styled．
