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单选题
A first magnitude star is（）.
A
2.5 times as bright as a second magnitude star
B
3 times as bright as a second magnitude star
C
5 times as bright as a second magnitude star
D
10 times as bright as a second magnitude star
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更多 “单选题A first magnitude star is（）.A 2.5 times as bright as a second magnitude starB 3 times as bright as a second magnitude starC 5 times as bright as a second magnitude starD 10 times as bright as a second magnitude star” 相关考题
考题
The three most common types of project cost estimates are:A . Order of magnitude, parametric, and budget.B . Parametric, definitive and top down.C . Order of magnitude, definitive and bottom up.D . Order of magnitude, budget and definitive.E . Analogy, parametric and top down.
考题
140 The three most common types of project cost estimates are:A. Order of magnitude, parametric, and budget.B. Parametric, definitive and top down.C. Order of magnitude, definitive and bottom up.D. Order of magnitude, budget and definitive.E. Analogy, parametric and top down
考题
三个最常用的项目成本估算模式是（ ）A．数学模拟order of magnitude参数法parametric及预算budgetB．参数法parametric确定的definitive及自上而下法top downC．数学模拟order of magnitude确定的definitive及自下而上法bottom upD．数学模拟order of magnitude预算budget及确定性的definitive
考题
Some two thousand million years ago, the mountain on the sun was raised probably because______.A. the star moved away from the sunB. another star happened to come near the sunC. fhe sun and the moon raised the tides on the earthD. a large tidal wave of a star travelled over the surface of the sun
考题
You are preparing to take another vessel in tow．Which signal indicates，Hawser is made fast ______．A.Firing of a green star signalB.Firing of a red star signalC.An orange smoke signalD.Three white star rockets at 1-minute intervals
考题
I think a good star should ___________ love his or her own county.A.at all
B.in all
C.first of all
D.after all
考题
They didn't seem to appreciate the magnitude of the problem.A:existence
B:importance
C:cause
D:situation
考题
共用题干
第一篇How the First Stars in the Universe Came into ExistenceResearchers believe that our universe began with the Big Bang（宇宙大爆炸）about 13 billion years ago,and that soon after that event,matter began to form as small dust grains and gases.How the first stars formed from this dust and gas has been a burning question for years,but a state-of-the-art computer simula- tion now offers the most detailed picture yet of how these first stars in the universe came into existence.The composition of the early universe was quite different from that of today,and the physics that governed the early universe were also somewhat simpler. Dr. Naoki Yoshida and colleagues in Japan and the U.S.incorporated these conditions of the early universe,sometimes referred to as the"cosmic dark ages",to simulate the formation of an astronomical object that would eventually shine its light into this darkness.The result is a detailed description of the formation of a protostar（原恒星）一the early stage of a mas- sive primordial（原始的）star of our universe , and the researchers ' computer simulation , which has been called a"cosmic Rosetta Stone"sets the bar for further investigation into the star formation process.The ques- tion of how the first stars evolved is so important because their formations and eventual explosions providedthe seeds for subsequent stars to come into being.According to their simulation,gravity acted on minute density variations in matter,gases,and the myste- riou;"dark matter"of the universe after the Big Bang in order to form this early stage of a star一a protostarwith a mass of just one percent of our sun. The simulation reveals how pre-stellar（前恒星的）gases would have actually evolved under the simpler physics of the early universe to form this protostar.Dr. Yoshida's simulation also shows that the protostar would likely evolve into a massive star capable ofsynthesizing（合成）heavy elements,not just in later generations of stars,but soon after the Big Bang."This general picture of star formation,and the ability to compare how stellar objects form in different time periods and regions of the universe,will eventually allow investigation into the origins of life and planets,"said Lars Herriquist,a professor of Astronomy at Harvard University and a co-author of this latest report."The abundance of elements in the universe has increased as stars have accumulated,"he says,"and the formation and destruction of stars continues to spread these elements further across the universe.So all ofthe elements in our bOdies originally formed from nuclear reactions in the centers of stars,long ago."Their simulation of the birth of a protostar in the early universe signifies a key step toward the ambitiousgoal of piecing together the formation of an entire primordial star and of predicting the mass and properties of these first stars of the universe.More powerful computers,more physical data,and an even larger range will be needed for further calculations and simulations,but these researchers hope to eventually extend this simu- lation to the point of nuclear reaction initiation一when a stellar object becomes a true star."Dr. Yoshida has taken the study of primordial star formation to a new level with this simulation,but it still gets us only to the halfway point towards our final goal.It is like laying the foundation of a skyscraper," said Volker Bromm,assistant professor of Astronomy at the University of Texas, Austin and the author of a companion article."We must continue our studies in this area to understand how the initially tiny protostar grows,layer by layer,to eventually form a massive star. But here,the physics become much more complicated and even more computational resources are needed."According to Paragraph 4,which of the following is NOT true about a protostar?A:It developed into a massive star during the Big Bang.B:It evolved from pre-stellar gases.C:It was able to integrate heavy elements when evolving into a massive star.D:It had a mass of one percent of the sun.
考题
共用题干
第一篇How the First Stars in the Universe Came into ExistenceResearchers believe that our universe began with the Big Bang（宇宙大爆炸）about 13 billion years ago,and that soon after that event,matter began to form as small dust grains and gases.How the first stars formed from this dust and gas has been a burning question for years,but a state-of-the-art computer simula- tion now offers the most detailed picture yet of how these first stars in the universe came into existence.The composition of the early universe was quite different from that of today,and the physics that governed the early universe were also somewhat simpler. Dr. Naoki Yoshida and colleagues in Japan and the U.S.incorporated these conditions of the early universe,sometimes referred to as the"cosmic dark ages",to simulate the formation of an astronomical object that would eventually shine its light into this darkness.The result is a detailed description of the formation of a protostar（原恒星）一the early stage of a mas- sive primordial（原始的）star of our universe , and the researchers ' computer simulation , which has been called a"cosmic Rosetta Stone"sets the bar for further investigation into the star formation process.The ques- tion of how the first stars evolved is so important because their formations and eventual explosions providedthe seeds for subsequent stars to come into being.According to their simulation,gravity acted on minute density variations in matter,gases,and the myste- riou;"dark matter"of the universe after the Big Bang in order to form this early stage of a star一a protostarwith a mass of just one percent of our sun. The simulation reveals how pre-stellar（前恒星的）gases would have actually evolved under the simpler physics of the early universe to form this protostar.Dr. Yoshida's simulation also shows that the protostar would likely evolve into a massive star capable ofsynthesizing（合成）heavy elements,not just in later generations of stars,but soon after the Big Bang."This general picture of star formation,and the ability to compare how stellar objects form in different time periods and regions of the universe,will eventually allow investigation into the origins of life and planets,"said Lars Herriquist,a professor of Astronomy at Harvard University and a co-author of this latest report."The abundance of elements in the universe has increased as stars have accumulated,"he says,"and the formation and destruction of stars continues to spread these elements further across the universe.So all ofthe elements in our bOdies originally formed from nuclear reactions in the centers of stars,long ago."Their simulation of the birth of a protostar in the early universe signifies a key step toward the ambitiousgoal of piecing together the formation of an entire primordial star and of predicting the mass and properties of these first stars of the universe.More powerful computers,more physical data,and an even larger range will be needed for further calculations and simulations,but these researchers hope to eventually extend this simu- lation to the point of nuclear reaction initiation一when a stellar object becomes a true star."Dr. Yoshida has taken the study of primordial star formation to a new level with this simulation,but it still gets us only to the halfway point towards our final goal.It is like laying the foundation of a skyscraper," said Volker Bromm,assistant professor of Astronomy at the University of Texas, Austin and the author of a companion article."We must continue our studies in this area to understand how the initially tiny protostar grows,layer by layer,to eventually form a massive star. But here,the physics become much more complicated and even more computational resources are needed."According to the last paragraph,all of the following are the goals of the simulation project EXCEPT__________.A:to know more about the mass and properties of the first stars of the universeB:to simulate the process of how the early universe beganC:to apply the. simulation to the study of nuclear reaction initiationD:to discover the truth about the formation of a protostar
考题
共用题干
第一篇How the First Stars in the Universe Came into ExistenceResearchers believe that our universe began with the Big Bang（宇宙大爆炸）about 13 billion years ago,and that soon after that event,matter began to form as small dust grains and gases.How the first stars formed from this dust and gas has been a burning question for years,but a state-of-the-art computer simula- tion now offers the most detailed picture yet of how these first stars in the universe came into existence.The composition of the early universe was quite different from that of today,and the physics that governed the early universe were also somewhat simpler. Dr. Naoki Yoshida and colleagues in Japan and the U.S.incorporated these conditions of the early universe,sometimes referred to as the"cosmic dark ages",to simulate the formation of an astronomical object that would eventually shine its light into this darkness.The result is a detailed description of the formation of a protostar（原恒星）一the early stage of a mas- sive primordial（原始的）star of our universe , and the researchers ' computer simulation , which has been called a"cosmic Rosetta Stone"sets the bar for further investigation into the star formation process.The ques- tion of how the first stars evolved is so important because their formations and eventual explosions providedthe seeds for subsequent stars to come into being.According to their simulation,gravity acted on minute density variations in matter,gases,and the myste- riou;"dark matter"of the universe after the Big Bang in order to form this early stage of a star一a protostarwith a mass of just one percent of our sun. The simulation reveals how pre-stellar（前恒星的）gases would have actually evolved under the simpler physics of the early universe to form this protostar.Dr. Yoshida's simulation also shows that the protostar would likely evolve into a massive star capable ofsynthesizing（合成）heavy elements,not just in later generations of stars,but soon after the Big Bang."This general picture of star formation,and the ability to compare how stellar objects form in different time periods and regions of the universe,will eventually allow investigation into the origins of life and planets,"said Lars Herriquist,a professor of Astronomy at Harvard University and a co-author of this latest report."The abundance of elements in the universe has increased as stars have accumulated,"he says,"and the formation and destruction of stars continues to spread these elements further across the universe.So all ofthe elements in our bOdies originally formed from nuclear reactions in the centers of stars,long ago."Their simulation of the birth of a protostar in the early universe signifies a key step toward the ambitiousgoal of piecing together the formation of an entire primordial star and of predicting the mass and properties of these first stars of the universe.More powerful computers,more physical data,and an even larger range will be needed for further calculations and simulations,but these researchers hope to eventually extend this simu- lation to the point of nuclear reaction initiation一when a stellar object becomes a true star."Dr. Yoshida has taken the study of primordial star formation to a new level with this simulation,but it still gets us only to the halfway point towards our final goal.It is like laying the foundation of a skyscraper," said Volker Bromm,assistant professor of Astronomy at the University of Texas, Austin and the author of a companion article."We must continue our studies in this area to understand how the initially tiny protostar grows,layer by layer,to eventually form a massive star. But here,the physics become much more complicated and even more computational resources are needed."What does the"an astronomical object"in Paragraph 2 refer to?A:Cosmic dark ages.B:Dust grains and gases.C:A protostar.D:The early universe.
考题
资料：Star Airways, Mumbai's dominant airline for the past five years, has reported it is planning to replace its entire aircraft fleet with European-produced Skystream jets. Starting with an initial purchase of 90 jets, Star Airways expects the changeover to take a decade to complete. The new planes will enable the airline to expand its international routes as well as provide replacements for its aging fleet of jet planes. Star Airways and Skystream, in a joint announcement at the Brussels Air Show on Thursday, said that the order included seventeen of the new AWB85O aircraft. This will make Star Airways the first Indian carrier to fly the AWB850, an aim it has had since the powerful jets were first produced.
What is NOT reported as a goal of Star Airways? A.To increase its number of flight destinations
B.To replace the older planes in its fleet
C.To be among the first to use a new aircraft
D.To relocate its international headquarters
考题
资料：Star Airways, Mumbai's dominant airline for the past five years, has reported it is planning to replace its entire aircraft fleet with European-produced Skystream jets. Starting with an initial purchase of 90 jets, Star Airways expects the changeover to take a decade to complete. The new planes will enable the airline to expand its international routes as well as provide replacements for its aging fleet of jet planes. Star Airways and Skystream, in a joint announcement at the Brussels Air Show on Thursday, said that the order included seventeen of the new AWB85O aircraft. This will make Star Airways the first Indian carrier to fly the AWB850, an aim it has had since the powerful jets were first produced.
How long is the change expected to take? A.Seventeen years
B.Ten years
C.Five years
D.Three years
考题
资料：Star Airways, Mumbai's dominant airline for the past five years, has reported it is planning to replace its entire aircraft fleet with European-produced Skystream jets. Starting with an initial purchase of 90 jets, Star Airways expects the changeover to take a decade to complete. The new planes will enable the airline to expand its international routes as well as provide replacements for its aging fleet of jet planes. Star Airways and Skystream, in a joint announcement at the Brussels Air Show on Thursday, said that the order included seventeen of the new AWB85O aircraft. This will make Star Airways the first Indian carrier to fly the AWB850, an aim it has had since the powerful jets were first produced.
What is the purpose of the article?A.To report on the merger of two airlines
B.To inform investors of updated project plans
C.To announce a new business agreement
D.To describe recent renovations at an airport
考题
According to the fourth paragraph, which of the following is NOT true?A. No nuclear explosion would be triggered inside the star.
B. The star would be destroyed completely.
C. Much of the star's matter thrown by the explosion would be beyond the black hole's reach.
D. The black hole would completely devour the star.
考题
Star Diagnosis诊断仪可以通过哪些方式升级？（）A、通过升级光盘为Star Diagnosis诊断仪升级B、通过USB存储并传输为Star Diagnosis诊断仪升级补丁（Addon）C、通过网络下载为Star Diagnosis诊断仪升级补丁（Addon）D、通过蓝牙传输为Star Diagnosis诊断仪升级补丁（Addon）E、以上升级方式均不正确
考题
Star Diagnosis诊断仪中软件是指？（）A、任何CD或DVDB、在Star Diagnosis中的程序C、SDconnectD、Star Diagnosis的连接电缆E、XENTRY connect
考题
关于Star Diagnosis诊断仪，下列哪项是不正确的？（）A、任何程序可以安装在Compact4的Star Diagnosis诊断仪系统中B、SD connect可以在任何Star Diagnosis诊断仪上操作C、Compact4的Star Diagnosis诊断仪有一个可充电电池D、Compact4不是目前Star Diagnosis诊断仪的升级版E、Basic 2不是目前Star Diagnosis诊断仪的升级版
考题
Star Diagnosis诊断仪出现问题，需要向Star Diagnosis诊断仪支持热线电话提供哪个重要编号？（）A、Star Diagnosis诊断仪的硬盘驱动器编号B、员工编号C、经销商编号D、Star Diagnosis诊断仪的系统编号E、Mac编号
考题
单选题The magnitude of a moment is the product of the force and（）.A
timeB
lever armC
displacementD
angle of inclination
考题
单选题The expression FIRST MAGNITUDE is usually used to refer only to bodies of magnitude（）.A
1.5 and greaterB
1.25 and greaterC
1.0 and greaterD
0.5 and greater
考题
单选题What is the lifesaving signal for，You are seen - assistance will be given as soon as possible?（）A
Green star rocketB
Red star rocketC
Orange smoke signalD
Horizontal motion of a flag
考题
单选题The separate supplies are connected in either star or delta formationThe star formation is most commonly used and requires（） slip-rings on the alternator.A
twoB
threeC
fourD
five
考题
单选题From the passage we know that Temple ______.A
was not good at dancingB
began to star in her first movie when she was ten years oldC
was unfriendly to her fansD
encouraged the whole country during the Great Depression
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