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One of the main differences between the various types of screw pumps is in the （）.
A . stuffing box diameter
B . direction of rotation of the screws
C . pitch of the screws
D . type of driving gear
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One of the differences between a two-stroke engine and a four-stroke engine is,（）
A . a two-stroke engine can’t work without cylinders
B . a two-stroke engine can’t work without pistons
C . a two-stroke engine can’t work without crankshafts
D . a two-stroke engine can’t work without a blower
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Which one of the followings is incorrect?（）
A . My vessel was anchored waiting for dry-docking
B . Only towards the end did I sound the alarm
C . Hearing emergency alarm,everyone got confused
D . When everything was almost under control, it is unnecessary to bother other
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One of the causes of ocean currents is density differences in the water. This is true because （）.
A . in an area of high density the water's surface is lower than in an area of low density
B . surface water flows from an area of high density to one of low density
C . the lesser the density gradient the freer the water is to move
D . it is the density differences that cause the currents to stay in the trough
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A network design shows that R1 has four different possible paths from itself to the Data Center subnets. Which one of the following commands is most likely to show you all the possible next - hop IP addresses for these four possible routes?（）
A . show ip eigrp topology
B . show ip eigrp topology all - links
C . show ip route eigrp
D . show ip route eigrp all - links
E . show ip eigrp topology all - learned
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Which one of the following varieties of NAT utilizes different ports to map multiple IP addresses to a single globally registered IP address?（）
A . Static NAT
B . Port loading
C . NAT Overloading
D . Dynamic NAT
E . None of the above
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What term is used to describe the process where one frame is placed into a different type of frame?（）
A . Framing
B . De-encapsulation
C . Encapsulation
D . De-framing
E . None of the above
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One of the ethnocentric attitudes is “I dislike interacting with people from different cultures.”
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Which one is the correct translation of “刘敏”
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Which of the following is NOT one of the types of idioms?
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Which one is not the merit of the computer？
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Which of the following is different from others? ( )
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Of the following, which is one of the negative symptoms of Schizophrenia?
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Which of the following is Not one of the three methods of reading?
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The Imput Hypothesis, one of the most famous theories among different models of language acquisition, is proposed by______.
A．Halliday
B．Chomsky
C．Krashen
D．Saussure
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2：Which of the following is one of the causes of the educational innovations？
A.Efforts made by church leaders.
B.Rallies held by graduates of Harvard University.
C.Demand for a more advanced mode of teaching among the graduates of the old colleges.
D.The limitation of the range of studies.
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Which is one of the problems of teleworking （)
A．A.Itsaves costs and reduces travel tim
B．B.Itimproves motivation and productivity.
C．C.It better balances work and family lif
D．D.How to manage teleworkers and evaluate their performance is still a problem.
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One of the differences between the Pacific Ocean and the Indian Ocean is that the former has______waves.
A．largest
B．large
C．larger
D．the largest
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A network design shows that R1 has four different possible paths from itself to the Data Center subnets.Which one of the following commands is most likely to show you all the possible next - hop IP addresses for these four possible routes？（）
A. show ip eigrp topology
B. show ip eigrp topology all - links
C. show ip route eigrp
D. show ip route eigrp all - links
E. show ip eigrp topology all - learned
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There are different ways in which people try to deal with the problem of energy. One way is the greater production of common energy sources, such as coal, oil and gas. The trouble with these sources, however, is that they are not renewable.
Another way is energy conservation (节能 ), which means using energy more efficiently (有效地 ). In some very cold countries people build special houses to save energy. They place materials between the inside and the outside of the walls of the house to keep the cold out and the warmth in. The house is heated by the lights, the body heat of the people and the other equipment in it.
Finally, renewable energy sources are used even though they are often expensive to develop. One form. of these is geothermal energy. In certain parts of the world the temperature of the earth increases thirty degrees centigrade with each kilometer down. At six kilometers, therefore, it rises to nearly two hundred degrees. To get the heat, water is pumped (压;抽 ) down into the rocks and back up to the surface. Heat from the earth is already used in certain countries.
1、How many ways of dealing with the energy problem are discussed in the text？ ()
A、Two.
B、Three.
C、Four.
D、Five.
2、From the text we learn that coal().
A、is quite easy to produce
B、is not used most efficiently
C、is the most common source of energy
D、could be renewed only by new technology
3、The writer tells about the "special houses" because they().
A、show the excellent skills of the builders
B、serve as an example of energy conservation
C、are heated by different sources of energy
D、are warmer than other types of houses
4、The underlined words "geothermal energy" in the third paragraph mean ().
A、renewable source
B、 underground source
C、 heat inside the earth
D、 temperature of the earth
5、At a place where the surface temperature is 15°C, how deep do you have to dig so as to get a temperature of 75 °C ？ ()
A、One km.
B、 Two km.
C、 Three km.
D、 Four km
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Many science reports discuss medical studies that test the effect of a new drug. Usually, a large number of people is divided into two groups. Each group takes a different substance. But no one knows which group is getting which substance. One group takes the medicine being tested. Another group takes what we call an inactive substance. Medical researchers call this substance a "placebo." The word "placebo" is Latin for "I shall please." Placebo pills(宽心丸)usually are made of sugar.
Using placebos to test drugs sometimes has a surprising result. Researchers say people taking the placebo often report improvements in their health. This is known as "the placebo effect"--pain that is eased or stopped by an inactive substance. In such testing, the drug must perform. better than the placebo to prove that it is effective.
Doctors have reported that the placebo effect can be used in treatment. For example, a doctor tells a patient that a new drug will stop the pain in his leg. The pill is only sugar. But the patient does not know that. He takes the pill and says his pain is gone.
Scientists are beginning to discover some physical reasons for this reaction in some people. They are learning that much of what people believe to be true comes from what the brain expects is going to happen. If the brain believes a drug will ease pain, the brain may begin physical changes in the body that can cause the expected effect. A recent examination of studies on drugs for depression found that placebos eased the depression about as well as the active drugs.
Other studies have explored the power of placebos. A study in Japan involved thirteen
people who reacted to the poison ivy (常青藤)plant. Poison-ivy causes red itchy sores(伤痕)on some people who touch it. Each person was rubbed on one arm with a harmless leaf, but was told it was poison ivy. Each person was then touched on the other arm with poison ivy, but was told it was a harmless leaf. All thirteen people developed a reaction on the arm where the harmless leaf touched their skin. Only two reacted to the poison ivy leaves.
Doctors and scientists worry that the use of placebos may not always be harmless. They say people can become victims of false doctors and others who use placebos to claim they can cure disease.
What do medical researchers usually use to make placebo pills？
A．Ivy leaves.
B．Harmless leaves.
C．Medicine being tested.
D．sugar.
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Which of the following is an accurate statement concerning utilization of different s
A．A.In combination, personal observation and written reports are considered superior to other methods
B．B.Statistical reports are the single most effective method
C．C.Managers should use as many as three different methods when possible
D．D.Managers should use all four methods, if possible
E．E.It is not advised to utilize oral reports and personal observation as dual methods
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Which one of the following is the characteristic of informal words？
A．Three or more than three syllables
B．Greek or Latin origin
C．Seldom used in daily conversation
D．Not borrowed from Greek, Latin, or French
