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单选题
The irregular black line around a charted light such as Race Rock Light indicates that it is （）.
A
unwatched
B
surrounded by riprap
C
a minor light
D
constructed on an artificial island
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更多 “单选题The irregular black line around a charted light such as Race Rock Light indicates that it is （）.A unwatchedB surrounded by riprapC a minor lightD constructed on an artificial island” 相关考题
考题
A radar range to a small，charted object such as a light will provide a line of position in which form?A.Straight lineB.ArcC.ParabolaD.Hyperbola
考题
A true bearing of a charted object，when plotted on a chart，will establish a ______.A.fixB.line of positionC.relative bearingD.range
考题
The irregular black line around a charted light such as Race Rock Light indicates that it is ______.A.unwatchedB.surrounded by riprapC.a minor lightD.constructed on an artificial island
考题
A vessel servicing a pipeline during the day shall display ______.A.three black shapes in a vertical line; the highest and lowest are balls，and the middle one is a diamondB.three shapes in a vertical line; the highest and lowest are red balls，and the middle one is a white diamondC.three black balls in a vertical lineD.two black balls in a vertical line
考题
A buoy marking a wreck will show a(an) ______.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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共用题干
Black HolesMost scientists agree that black holes exist but are nearly impossible to locate.A black hole in the universe is not a solid object,like a planet,but it is shaped like a sphere（球体）. Astronomers（天文学家）think that at the center of a black hole there is a single point in space with infinite（无限的）density（稠密）.This single point is called a singularity（奇点）. If the singularity theory is correct,it means that when a massive star collapses,all the material in it disappears into the singularity.The center of a black hole would not really be a hole at all,but an infinitely dense point.Anything that crosses the black hole is pulled in by its great gravity.Although black holes do exist,they are difficult to observe.These are the reasons.No light or anything else comes out of black holes.As a result,they are invisible to a telescope.In astronomical terms,black holes are truly tiny.For example,a black hole formed by the collapse of a giant star would have an event horizon（视界）only 18 miles across.The nearest black holes would be dozens of light years away from Earth.One light year is about 6 trillion（万亿）miles. Even the most powerlul telescopes could not pick out an object so small at such a great distance.In 1994 the Hubble Space Telescope provided evidence that black holes exist.There are still answers to be found,however,so black holes remain one of the mysteries of the universe.The nearest black holes are hundreds of light years away from us.A:Right B:Wrong C:Not mentioned
考题
Light rays are turned aside by the intense gravitational field surrounding a black hole.A:heightened
B:deflected
C:rotated
D:created
考题
The interview took place around the kitchen table and was very casual .A: formal
B: informal
C: regular
D: irregular
考题
送撇缆上岸。（）A、Send rope to shore .B、Send heavy line to shore .C、Send heaving line ashore .D、Send light line ashore .
考题
Which of the following is the correct wiring order for an RJ-11 two line jack？（）A、Black，Green，Red，YellowB、Black，Red，Green，YellowC、Red，Black，Green，YellowD、Yellow，Red，Green，Black
考题
单选题The Coordinator Surface Search in a SAR situation should display by day（）.A
the code flags FRB
a black ball over a black diamond shapeC
code flag Quebec over a black ballD
two black diamond shapes in a vertical line
考题
单选题A vessel engaged in trawling will show identification lights of（）.A
a red light over a white lightB
a white light over a red lightC
a green light over a white lightD
two red lights in a vertical line
考题
单选题A vessel showing a green light over a white light in a vertical line above the level of the sidelights is（）.A
engaged in underwater constructionB
under sail and powerC
a pilot vesselD
trawling
考题
单选题A line of position formed by sighting two charted objects in line is called a(n)（）.A
relative bearingB
range lineC
track lineD
estimated position
考题
单选题When using a buoy as an aid to navigation which of the following should be considered?（）A
The buoy should be considered to always be in the charted locationB
If the light is flashing，the buoy should be considered to be in the charted locationC
The buoy may not be in the charted positionD
The buoy should be considered to be in the charted position if it has been freshly painted
考题
单选题At 0630 you increase speed to 12.0 knots. At 0645 Race Rock Light bears 294°pgc. At 0700 Race Rock Light bears 293°pgc. Based on this，you should（）.A
alter course to portB
maintain course and speedC
alter course to starboardD
maintain course and reduce speed
考题
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
考题
单选题A line of position is（）.A
a line connecting two charted objectsB
a line on some point of which the vessel may be presumed to be locatedC
the position of your vesselD
not used in a running fix
考题
单选题A vessel servicing a pipeline during the day shall display（）.A
three black shapes in a vertical line; the highest and lowest are balls，and the middle one is a diamondB
three shapes in a vertical line; the highest and lowest are red balls，and the middle one is a white diamondC
three black balls in a vertical lineD
two black balls in a vertical line
考题
单选题A vessel transferring provisions or cargo at sea shall display during the day（）.A
two black balls in a vertical lineB
three black balls in a vertical lineC
three shapes in a vertical line； the highest and lowest shall be red balls and the middle a white diamondD
three black shapes in a vertical line； the highest and lowest shall be balls and the middle one a diamond
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A radar range to a small，charted object such as a light will provide a line of position in which form? （）A
Straight lineB
ArcC
ParabolaD
Hyperbola
考题
单选题A rolling hitch can be used to（）.A
make a temporary eyeB
mouse a hookC
secure a line around a sparD
shorten a line
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