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The shock wave which followed the dazzling light
A. has remained a puzzle
B. lacks sufficient evidence
C. is a university professor
D. was generated by the explosion
E. will kill many animals
F. are attacked by aliens
B. lacks sufficient evidence
C. is a university professor
D. was generated by the explosion
E. will kill many animals
F. are attacked by aliens
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更多 “ The shock wave which followed the dazzling lightA. has remained a puzzle B. lacks sufficient evidence C. is a university professor D. was generated by the explosion E. will kill many animals F. are attacked by aliens” 相关考题
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共用题干
Learn about Light1 .Ancient civilizations were amazed by the existence of light for thousands of years. The Greek philosophers believed that light was made up of countless,tiny particles that enter the human eye and create what we call vision. However,Empedocles and a Dutch scientist named Christian Huygens believed that light was like a wave. According to them,light spread out and travelled like a straight line. This theory was accepted during the 19th century.2 .In 1905,Albert Einstein published a research paper in which he explained what is re-ferred to as the photoelectric effect. This theory explains that particles make up light.The particles Einstein was referring to are weightless bundles（束）of electromagnetic（电磁）energy called photons（光子）.Today,scientists agree that light has a dual（二重）nature一it is part particle and part wave. It is a form of energy that allows us to see things around us.3 .Things that give off light are known as sources of light. During the day,the primary source of light is the sun. Other sources of light include stars,flames,flashlights,street lamps and glowing gases in glass tube.4 .When we draw the way light travels we always use straight lines. This is because nor-mally light rays travel in a straight line. However,there are some instances that can change the path and even the nature of light. They are reflection,absorption,interference（干扰）, etc.5 .Physicists have attempted to measure the speed of light since the early times. In 1849, Hippolyte Fizeau conducted an experiment by directing a beam of light to a mirror located kilometers away and placed a rotating cogwheel（旋转齿轮）between the beam and the mirror. From the rate of rotation of the wheel,number of wheel's teeth and distance of the mirror,he was able to calculate that the speed of light is 313 million meters per second. In a vacuum（真空）,however,the speed of light is 299,792,458 meters per second. This is about a million times faster than the speed of an airplane.Objects are visible to the human eye as light is______.A: sources of lightB: the speed of lightC: the path of lightD: a straight lineE: a beam of lightF: a form of energy
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共用题干
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共用题干
Learn about Light1 .Ancient civilizations were amazed by the existence of light for thousands of years. The Greek philosophers believed that light was made up of countless,tiny particles that enter the human eye and create what we call vision. However,Empedocles and a Dutch scientist named Christian Huygens believed that light was like a wave. According to them,light spread out and travelled like a straight line. This theory was accepted during the 19th century.2 .In 1905,Albert Einstein published a research paper in which he explained what is re-ferred to as the photoelectric effect. This theory explains that particles make up light.The particles Einstein was referring to are weightless bundles（束）of electromagnetic（电磁）energy called photons（光子）.Today,scientists agree that light has a dual（二重）nature一it is part particle and part wave. It is a form of energy that allows us to see things around us.3 .Things that give off light are known as sources of light. During the day,the primary source of light is the sun. Other sources of light include stars,flames,flashlights,street lamps and glowing gases in glass tube.4 .When we draw the way light travels we always use straight lines. This is because nor-mally light rays travel in a straight line. However,there are some instances that can change the path and even the nature of light. They are reflection,absorption,interference（干扰）, etc.5 .Physicists have attempted to measure the speed of light since the early times. In 1849, Hippolyte Fizeau conducted an experiment by directing a beam of light to a mirror located kilometers away and placed a rotating cogwheel（旋转齿轮）between the beam and the mirror. From the rate of rotation of the wheel,number of wheel's teeth and distance of the mirror,he was able to calculate that the speed of light is 313 million meters per second. In a vacuum（真空）,however,the speed of light is 299,792,458 meters per second. This is about a million times faster than the speed of an airplane.Paragraph 5______A: How Is the Nature of Light Explained Today?B: What Are Sources of Light?C: How Did Physicists Measure the Speed of Light?D: How Does Light Travel?E: How Did People Think of Light Years Ago?F: What Causes a Shadow?
考题
One of the properties of light is（ ）traveling in wave form as it goes from one place to another.A.it
B.it’s
C.its
D.their
考题
The shock wavewhich followed the dazzling lightA. has remained a puzzle
B. lacks sufficient evidence
C. is a university professor
D. was generated by the explosion
E. will kill many animals
F. are attacked by aliens
考题
共用题干
Learn About Light1 Ancient civilizations were amazed by the existence of light for thousands of years?The Greek philoso- phrrs believed that light was made up of countless,tiny particles that enter the human eye and create what we call vision.However,Empedocles and a Dutch scientist named Christian Huygens believed that light wag like a wave.According to them,light spread out and travelled like a straight line.This theory was acceptedduring the 19th century.2 In 1905,Albert Einstein published a research paper in which he explained what is referred to as the photoelectric effect.This theory explains that particles make up light.The particles Einstein was referring to are weightless bundles（束）of electromagnetic（电磁）energy called photons（光子）.Today,scientists agree that light has a dual（二重）nature一it is part particle and part wave. It is a form of energy that allows us tosee things around us.3 Things that give off light are known as sources of light.During the day,the primary source of light is the sun.Other sources of light include stars,flames,flashllights,street lamps and glowing gases in glass tube.4 When we draw the way light travels we always use straight lines.This is because normally light rays travel in a straight line.However,there are some instances that can change the path and even the nature of light. They are reflection,absorption,interference（干扰）,etc.5 Physicists have attempted to measure the speed of light since the early times.In 1849,Hippolyte Fizeau conducted an experiment by directing a beam of light to a mirror located kilometers away and placed a rotating cogwheel（旋转齿轮）between the beam and the mirror. From the rate of rotation of the wheel, number of wheel'S teeth and distance of the mirror,he was able to calculate that the speed of light is 313 million meters per second.In a vacuum（真空）,however,the speed of light is 299,792,458 meters per second.This is about a million times faster than the speed of an airplane.Objects are visible to the human eye as light is_______. A:sources of lightB:the speed of light C:the path of lightD:a straight lineE:a beam of lightF:a form of energy
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Which of the following is the process a scanner uses to scan images to a computer？（）A、Light is shown through the image and onto the scanner headB、Light is reflected off a mirror onto the Charged Coupled Device （CCD）C、Light is flashed off a mirror onto the CCDD、Light is reflected off the image and into a camera
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which tolls is used for planing for Micro wave Within PaO？（）A、Actll B、Connect C、AssetD、Planet
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单选题Fetch is the（）.A
Distance a wave travels between formation and decayB
Stretch of water over which a wave-forming wind blowsC
Time in seconds required for two crests to pass a given pointD
Measurement of a wave's steepness
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单选题A tropical wave is located 200 miles due west of your position，which is north of the equator. Where will the wave be in 24 hours? （）A
Farther away to the westB
Farther away to the eastC
In the same placeD
Closer and to the west
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单选题Sometimes lights are（）by fog，haze，dust，smoke，or precipitation which may be present at the light，or between the light and the observer，and which is possibly unknown by the observer.A
obscuredB
darkenedC
greyedD
delighted
考题
单选题A thrust block is designed to（）.A
transmit the thrust of the engine to the propellerB
transmit the thrust of the propeller to the vesselC
absorb the shock of wave pressure at the bowD
be placed between the engines and the foundation to absorb the vibration
考题
单选题An anchored vessel on pilotage duty must show which light(s) at night? （）A
A sternlight onlyB
Anchor lights onlyC
A white light over a red light onlyD
A white light over a red light and anchor lights
考题
单选题An overtaking situation at night would be one in which one vessel sees which light(s) of a vessel ahead?（）A
Masthead lights and sidelightsB
One sidelight，the masthead lights and stern lightC
Both sidelightsD
Stern light
考题
单选题A vessel is overtaking when she can see which light(s) of a vessel ahead?（）A
Only the stern light of the vesselB
One sidelight and a masthead light of the vesselC
Only a sidelight of the vesselD
The masthead lights of the vessel
考题
单选题An occulting light is one in which （）.A
the period of darkness exceeds the period of lightB
there is only a partial eclipse of the lightC
the periods of light and darkness are equalD
the period of light exceeds the period of darkness
考题
单选题Which statement concerning Montauk Point Light is TRUE（）.A
The light comes on at sunsetB
There is an emergency light if the main light is extinguishedC
The height of the light is 24 feetD
The tower is painted with black and white stripes
考题
单选题Which cleaning product should be used for the inside of a computer？（）A
glass cleanerB
a simple ammonia and water solution followed by an antistatic solutionC
a bleach solution followed by waterD
compressed air
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单选题Which is NOT a symptom of traumatic shock?（）A
Slow，deep breathingB
Pale，cold skinC
Weak，rapid pulseD
Restlessness and anxiety
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