题目内容
（请给出正确答案）
A.pretend to be
B.imitate
C.reproduce
D.unify
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更多“A sheet of metal can be shaken…”相关的问题
A sheet of metal can be shaken to ________ thunder.
A．stimulate
B．forge
C．fabricate
D．simulate
A sheet of metal was shaken to ______ the sound of thunder.
A．stimulate
B．simulate
C．reproduce
D．duplicate
A．p r e t e n d t o b e
B．i m i t a t e
C．r e p r o d u c e
D．u n i f y
The metal sheet used to imitate thunder must be________．
A．tightly fastened on all sides
B．lying flat
C．both A and B
D．neither A nor B
根据以下材料，回答 40～43 问题。
During a television play the sound man must be ready to make every sound as it is needed．Sound effects are of three kinds：real，imitated and recorded．
Real sounds are those of doorbells，telephone bells，and other small objects easy to keep in a studio． But the sound man must imitate many sounds． For bacon fryin9，he crumples cellophane paper．A long sheet of metal hanging in a doorway makes thunder·He taps one rubber sink plunger and then another on a table to imitate a horse walking on pavement． For a horse galloping along a gravel road，the sound man can use the two halves of a coconut，pounding each in turn very fast on the table．
Recorded sound effects are used for noises he cannot himself produce offstage．He pays records for such sounds as a rooster crowing， a train leaving a station， and a baby crying．
The sound man is an important part of any television production．
第 40 题 The sound man is important because he________
A．is kept busy
B．makes fl TV play more lifelike
C．1ets an actor know when to life a telephone receiver
D．is always learning new methods
All of the following would necessarily involve mechanical effects EXCEPT
A．using wires to make objects fly
B．fihning each half of a frame. separately
C．hitting a sheet of metal to create thunder
D．building a small model of a town
Not only is gold beautiful, but it is virtually indestructible. It will not rust or corrode; gold coins and products fabricated from the metal have survived undamaged for centuries. Gold is extremely easy to work with; one ounce, which is about the size a cube of sugar, can be beaten into a sheet nearly 100 square feet in size, and becomes so thin that light passes through it , an ounce of gold can also be stretched into a wire 50 miles long. Gold conducts electricity better than any other substance except copper and silver, and it is particularly important in the modern electronics industry.
People have always longed to possess gold. Unfortunately, this longing has also brought out the worst in the human character. The Spanish conquistadors robbed palaces, temples, and graves and killed thousands of Indians in their ruthless search for gold. Often the only rule in young California during the days of the gold rush was exercised by the mob with a rope. Even today, the economic running of South Africa's gold mines depends largely on the employment of black laborers who are paid about-40 a month, plus room and board and who must work in conditions that can only be described as cruel. About 400 miners are killed in mine accidents in South Africa each year, or one for every two tons of gold produced.
Great Britain was the first country to adopt the gold standard, when the Master of the Mint, Sir Isaac Newton. established a fixed price for gold in 1717. But until the big discoveries of gold in the last half of the nineteenth century-starting in California in 1848 and later in Australia and South Africa-there simply wasn't enough gold around for all the trading nations to link their currencies to the precious metal.
Historically, the desire to hoard gold at home has been primarily an occupation of the working and peasant classes, I who have no faith in paper money. George Bernard Shaw defended their instincts eloquently:" You have to choose between trusting to the natural stability of gold and the natural stability of the honesty and intelligence of the members of the government," he said, "and with due respect to these gentlemen, I advise you.., to vote for gold."
Until the big gold discoveries in the late nineteenth century ______.
A．most nations adopted the gold standard
B．the trading nations were unable to get enough gold
C．gold coins were used by most nations
D．gold ceased to be an important metal
1) Milling is carried out on a machine tool called a “milling machine” that is used for the shaping of metal and other solid materials. 2) Casting is a manufacturing process by which a liquid material is poured into a mold containing a cavity of the desired shape, and then allowed to solidify. 3) Stamping is a metal working process in which sheet metal is formed into a desired shape by pressing or punching it on a machine press. 4) With current technology, the most effective method of CO ₂ capture from the flue gas of a PC plant is by chemical reaction with an organic solvent such as monoethanolamine (MEA), one of a family of amine compounds. In a vessel called an absorber, the flue gas is “scrubbed” with an amine solution, typically capturing 85% to 90% of the CO ₂. The CO ₂ -laden solvent is then pumped to a second vessel, called a regenerator, where heat is applied (in the form of steam) to release the CO ₂. The resulting stream of concentrated CO ₂ is then compressed and piped to a storage site, while the depleted solvent is recycled back to the absorber.
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