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The vertical component of the Earth’s magnetic field causes induced magnetism in vertical soft iron. This changes with latitude. What corrects for this coefficient of the deviation? （）
A . The Flinders bar
B . The heeling magnet
C . Quadrantal soft iron spheres
D . Bar magnets in the binnacle
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Many cast iron pistons are designed with heat dams, which serve to （）
A . keep piston crown temperatures elevated for smoother combustion
B . reduce the possibility of overheating the top compression ring
C . help retain the heat of compression to prevent ignition delay
D . help retain the heat of compression to prevent combustion knock
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The crankshaft is of the semi built type, with the journal （） the forged or cast steel crank throws.
A . being shrunk into
B . to be shrunk into
C . to be shrunk with
D . shrinking into
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An aluminum piston has lower inertia and higher coefficient of （） compared to that of cast iron.
A . viscosity
B . twisting moments
C . inertia
D . thermal expansio
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A number of cylinder liners are enclosed in one cast iron casing to form a （）.
A . cylinder cover
B . cylinder block
C . cylinder frame
D . bed-plate
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Cast iron pistons used in large propulsion diesel engines are constructed with （）
A . not taper what so ever
B . the skirt being tapered and smaller than the crown
C . the skirt being tapered and larger than the crown
D . the crown being tapered and smaller than the skirt
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The smith soon（）three iron shoes for the horse.
A . forged
B . formed
C . framed
D . formatted
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At the magnetic equator there is no induced magnetism in the vertical soft iron because（）.
A . the lines of force cross the equator on a 0°-180°alignment
B . the quadrantal error is 0°
C . there is no vertical component of the Earth's magnetic field
D . the intercardinal headings have less than 1°
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Cast iron and gunmetal fittings are used freely in small sizes at moderate pressure; large fittings, those for high pressure and temperature are cast or mild steelIn the above sentence, the word “those” means （）.
A . east iron firings
B . mild steel fittings
C . small fittings
D . large fitting
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An advantage of aluminum pistons, when compared to cast iron pistons is （）.
A . greater high temperature strength
B . better heat conductivity
C . greater weight per cubic inch
D . increased resistance to wear
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"Cast iron has poor corrosion resistance to sea water, especially in the presence of bronzes" Implies（）.
A . east iron is a cheap material
B . cast iron can pollute sea water
C . cast iron has mere corrosive than bronzes to sea water
D . cast iron is more corrosive to sea water when it meets with bronze
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At the top of the A-frames there is a strong cast iron frame called （）.
A . cylinder liner
B . cylinder cover
C . the gear box
D . the scavenging box
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According to the lecture, casting a movie is ______.
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The children went there to watch the iron tower ______ .
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The idiom “to cast pearls before swine” means ________
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The author makes clear both the effects of iron deficiency on people’s health and the
是
否
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Enter the information age. Information is the raw material for many of the business activities【62】this new era, just as iron and steel were the basic commodities in the【63】of the industrial age.
The world's knowledge is said to be doubling every eight years. This knowledge【64】is stimulating economic progress. The need to collect, analyze, and communicate great【65】of information is producing new products and services, creating jobs, and【66】career opportunities.
The information age is【67】considered to be a phenomenon of the service sector of the economy,【68】than a product of heavy industry. Certainly, rocketing information technologies are creating new capabilities【69】knowledge-based service spheres.【70】changes just as dramatic are【71】industry, giving people the【72】to do challenging work in exciting new ways.
Manufacturing is full【73】in the information age. From design to production, the manufacturing【74】has long been information-intensive. It always has required exacting communication to describe what goes into products and how to make them. Now, computer technology is giving factory managers new【75】to gather all of this information and use it to control production.
Telecommunications are producing error-free communication between the design office and the factory. Computer-aided design is enabling engineers to【76】product performances and manufacturing process on video displays, before resources are committed to build and test prototypes. Techniques like these are bringing【77】new advances in manufacturing productivity. Just as coal fueled the【78】to an industrial society, so microelectronics is powering the【79】of the information age. Microelectronic information management tools are【80】U.S. industrial capabilities, which remains【81】to America's economic wellbeing and national security.
(63)
A．seeking
B．stimulating
C．shaping
D．securing
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The major component of the "pitch-black dust"（Line 5, Paragraph 3) should be ______A．iron.
The major component of the "pitch-black dust"(Line 5, Paragraph 3) should be ______
A．iron.
B．magnesium.
C．silicate.
D．carbon.
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（)The settlers introduced iron tools, muskets for hunting, domesticated animals, and
A．A.True
B．B.False
C．C.Not Mentioned
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At length as the craft was cast to one side, and ran ranging along with the White Whale's flank, he seemed strangely oblivious of its advance—as the whale sometimes will---and Ahab was fairly within the smoky mountain mist, which, thrown off from the whale's spout, curled round his great Monadnock hump; he was even thus close to him; when, with body arched back, and both arms lengthwise high-lifted to the poise, he darted his fierce iron, and his far fiercer curse into the hated whale.
Question:
1. From which novel is this paragraph taken？
2. What is the name of the novelist？
3. What is the theme of the novel？
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Often, （） also helps to reveal the real meaning of a message. For example, “He is very clever.” said with an ironic tone means just the opposite（）
A．vocabulary
B．pronunciation
C．intonation
D．fluency
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When the suspected criminal appeared in court, the judge cast a______look at him.
A．straightforward
B．sharp
C．stern
D．savage
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Emerson’s guidelines for the practice of self-reflection can be summed up in his famous saying: “___: every heart vibrates to that iron string.”（）
A．Trust nature
B．Trust others
C．Trust thyself
D．Trust God
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“铁影壁”是元代的文物。译：The Iron Screen is（)of the Yuan Dynasty.
