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Radiation fog is more commonly encountered in().
A . spring
B . later winter
C . autumn
D . end of summer
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In the event of a fire, the doors to a stair tower must be closed to prevent the spread of fire by ().
A . convection
B . conduction
C . radiation
D . ventilatio
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A package contains nitric acid solution and is radioactive. The radiation level at the package surface is 36 millirems per hour. How should this package be labeled? ()
A . Radioactive II and oxidizer
B . Radioactive II and poison
C . Radioactive I and corrosive
D . Fissile class I
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When fighting a spreading fire resulting from a broken fuel line, you should FIRST ().
A . look for a CO
extinguisher
B . use a soda acid extinguisher
C . shut off the fuel supply
D . smother the fire with rag
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Convection spreads a fire by().
A . heated gases flowing through ventilation syetem
B . the transfer of heat across an unobstructed space
C . burning liquids flowing into another space
D . transmitting the heat of a fire through the ships metal
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A fire may be spread by which of the following means?()
A . Conduction of heat to adjacent surfaces
B . Direct radiation
C . Convection
D . All of the above
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The spreading of fire as a result of heat being carried through a vessels ventilation system, is an example of heat transfer by ().
A . conduction
B . convection
C . radiation
D . windage
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Ebola virus can spread among humans primarily through unprotected direct contact of skin or mucous membranes with blood or body fluids of a person who is ill with EVD, or the _____ of a deceased patient who had EVD.
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Which is not the type of Ionizing Radiation()?
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Beginning in the 1970s, the practice of trick-or-treating went into a sharp decline after unsubstantiated rumors spread about homeowners distributing poisoned Halloween candy to children.
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radiation造词理据()
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In addition to getting them vaccinated ( 接种疫苗 ) against both seasonal and H1N1 flu, teach your kids basic hygiene habits, which can _______ in preventing the spread of the virus.
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The black hole is ( ), and no particle or electromagnetic radiation can escape from it.
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Some animals can spread deadly diseases to human beings.
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That widely spread news______a rumor.
A.proved being
B.proved
C.were proved
D.was proved that
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Radiation can cause serious consequences at the lowest level______.
A.when it kills few cells
B.if it damages the few cells
C.though the damaged cells can repair themselves
D.unless the damaged cells can reproduce themselves
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Dealers will quote a narrow bid-ask spread for a particular issue if______.
A.the volume of transactions in that issue is large
B.the price volatility of that issue is low
C.competitive pressures are high
D.all of the above
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The term “mobile phone newspapers” refers to the news published in regularly recurring text and spread through mobile phones. The statement is a fact.
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The difference between Z-spread and nominal spread will most likely be the most significant for a:
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推广先进适用技术工程和生物措施,可使每公顷产量提高1,500公斤以上。译文:The grain output per hectare can ()through spreading the use of advanced agrotechnology.
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In 1997, devotees of home electronics eagerly awaited the DVD player, a new device that could play movies without videotape, and with greater clarity. It caught on even faster than CD music players and within four years, DVD movies surpassed VHS tapes in sales. The DVD's success is just on example of a historic shift from analog to digital technologies. They began with computing and are now spreading to industries from banking to publishing. Products and services are shedding the limits of their physical form. to become encoded information that never degrades, can be reproduced perfectly and distributed around the world in minutes, or less.
Another example is photography: by the end of this year, tile number of images captured digitally each day is expected to surpass the number of images captured on film. With digital cameras and other devices linked to personal computers, we can collect vast amounts of data, which fortunately takes up little or no closet space. Today's average personal computer has a hard drive that can store 300 times more information than a decade ago. Technologies, such as broadband e-commerce, are expected to be the primary means of delivering entertainment and media by the end of this decade. Even life itself is increasingly digitized. The human genome(基因组), the recipe for our genetic makeup, has been mapped and encoded and researchers are harnessing the power of computing to accelerate the development, of new, lifesaving drugs.
The implications of this broad, digital revolution are enormous, although they tend to be over-shadowed by the struggles of high-tech industries to recover from the go-go years of the 1990s. Those struggles are real, yet there are reasons for optimism about a return to robust economic growth and job creation in the next several years. The digital innovations(创新) of the past two decades continue to bear fruit, so stay tuned for good news--digitally, of course.
Digital technologies really began to take form. when ______.
A.information was encoded
B.DVD technology was introduced
C.it was used with photography
D.used in computing
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Advertisement can be thought of "as the means of making known in order to buy or sell goods or services". Advertisement aims to increase people's awareness and arouse interest. It tries to inform. and to persuade. The media are all used to spread the message. The press offers a fairly cheap method, and magazines are used to reach special sections of the market. The cinema and commercial radio are useful for local market. Television, although more expensive, can be very effective. Public notices are fairly cheap and more permanent in their power of attraction. Other ways of increasing consumer interest are through exhibitions and trade fairs as well as direct mail advertisement.
There can be no doubt that the growth in advertisement is one of the most striking features of the western world in this century. Many businesses such as those handling frozen foods, liquor, tobacco and medicines have been built up largely by advertisement.
We might ask whether the cost of advertisement is paid for by the producer or by the customer. (19) Since advertisement forms part of the cost of production, which has to be covered by the selling price, it is clear that it is the customer who pays for advertisement. However, if large scale advertisement leads to increased demand, production costs are reduced, and the customer pays less.
It is difficult to measure exactly the influence of advertisement on sales. When the market is growing, advertisement helps to increase demand. When the market is shrinking, advertisement may prevent a bigger fall in sales than would occur without its support. What is clear is that businesses would not pay large sums for advertisement if they were not convinced of its value to them.
Advertisement is often used to______.
A.deceive customers
B.increase production
C.arouse suspicion
D.push the sale
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The use of nuclear power has already spread all over the world.(1), scientists still have not agreed(2)what should be done with the large amounts of waste material that(3)to increase every year. Most waste materials are(4)of simply by placing them somewhere. But nuclear waste must be(5)with great care. It(6)dangerous radiation and it will continue to be(7)for hundreds, thousands, even millions of years.
How should we get(8)of such waste material in such a way(9)it will not harm the(10)? Where can we(11)distribute it? One idea is to put this radioactive waste inside a thick container, which is(12)dropped to the deep bottom of the ocean.(13)some scientists believe that this way of(14)nuclear waste could kill fish and other living things in the oceans or interfere(15)their growth. Another way to(16)nuclear waste is to send it into space, to the sun,(17)it would be burned. Other scientists suggest that this polluting material be(18)thousands of meters under the earth’s surface. Such underground areas must be free(19)possible earthquakes. Advances are being made. But it may still be many years(20)this problem could be finally settled.
1. A .Moreover B However C Therefore D Otherwise
2. A .on
B. with
C. to
D. in
3. A. incline
B. start
C. tend
D. keep
4. A .drained
B. dumped
C. discharged
D. disposed
5. A .dealt
B. handled
C. coped
D. processed
6. A .drops off
B. gives off
C. leaves off
D. sets off
7. A .efficient
B. unfavorable
C. deadly
D. painful
8. A. touch
B. hold
C. grasp
D. rid
9. A. so
B. which
C. that
D. thus
10. A. environment
B. situation
C. location
D. residence
11. A .reasonably
B. rationally
C. regularly
D. safely
12. A .then
B. even
C. ever
D. only
13. A .And
B. But
C. Still
D. Thereby
14. A. scattering
B. preserving
C. containing
D. discarding
15. A. in
B. with
C. against
D. at
16. A. remove
B. deliver
C. transport
D. spread
17. A. where
B. when
C. there
D. while
18. A. covered
B. deposited
C. buried
D. reserved
19. A. from
B.of
C. for
D. about
20. A. until
B. after
C. before
D. unless
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The source informed the reporter that though the fire in the TV show house spread rapidly, a team of four specifically trained staff______it immediately and put it out in ten minutes.
A.paid attention to
B.looked up to
C.attended to
D.attached importance to