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How is the intensity of a light expressed in the Light Lists?______.
A.Luminous range
B.Geographic range
C.Nominal range
D.Meteorological range
参考答案
更多 “ How is the intensity of a light expressed in the Light Lists?______.A.Luminous rangeB.Geographic rangeC.Nominal rangeD.Meteorological range ” 相关考题
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How many life buoys________on board with self-igniting light?A.there existB.there isC.there areD.are there
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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
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Mariners are FIRST warned of serious defects or important changes to aids to navigation by means of ______.A.marine broadcast Notice to MarinersB.Weekly Notices to MarinersC.corrected editions of chartsD.Light Lists
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The question "How fast did he drive when he ran the red light?" __________ "He ran the red light".
A．presupposes
B．entails
C．contradicts
D．includes
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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?
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产生彩色投影必须调整下面哪个参数（）A、light的light transmission设为100%B、light的light transmission设为0%C、投影层的阴影层的light transmission设为80%D、接受阴影层的light transmission设为100%
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单选题How is the intensity of a light expressed in the Light Lists?（）.A
Luminous rangeB
Geographic rangeC
Nominal rangeD
Meteorological range
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单选题The color of the exhaust from a diesel engine should be （）A
clearB
hazy light brownC
hazy light blueD
hazy light grey
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单选题（）are located on the road panel of main switchboard.A
Megohm meter, insulation light and synchroscopeB
Synchroscope, synchro light and megohm meterC
Shore power switch, insulation light and synchroscopeD
Megohm meter, insulation light and shore power switch
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单选题A buoy marking a wreck will show a(n)（）.A
white light FL (2) and a topmark of 2 black spheresB
occulting green light and may be letteredC
yellow light and will be numberedD
continuous quick white light and may be numbered
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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
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单选题A vessel trawling will display a（）.A
red light over a white lightB
green light over a white lightC
yellow light over a red lightD
white light over a green light
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单选题A hollow-cathode lamp is（）A
A broad-band light sourceB
A narrow-band light sourceC
A light detectorD
Not a light source
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单选题打开锚灯！ （）A
Switch on the deck light!B
Switch on the anchor light!C
Switch on the cargo light!D
Switch on the hold light!
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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How many life buoys（）on board with self-igniting light?A
there existB
there isC
there areD
are there
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单选题Light Lists for coastal waters are（）.A
published every year and require no correctionsB
published every second year and must be correctedC
published every five years and require no correctionD
accurate thru NM number on title page and must be corrected
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单选题An alternating light（）.A
shows a light with varying lengths of the lighted periodB
shows a light that changes colorC
marks an alternate lesser-used channelD
is used as a replacement for another light
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单选题Why does the speaker ask us to consider “turning off a light switch”?A
To show that the climate system is sensitive to light.B
To illustrate the sudden move from one climate state to another.C
To demonstrate how to operate the light switch.D
To explain how the operating mode works under increasing pressure.
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单选题When making landfall at night，you can determine if a light is a major light or an offshore buoy by（）.A
the intensity of the lightB
checking the period and characteristics against the Light ListC
the color，because the buoy will have only a red or a green lightD
Any of the above can be used to identify the light
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单选题A towing light is（）.A
shown below the sternlightB
white in colorC
displayed at the mastheadD
a yellow light having the same characteristics as the stern light
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