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单选题
The four standard light colors used for lighted aids to navigation are red，green，white，and （）.
A
purple
B
orange
C
blue
D
yellow
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第三篇Ways to Create Colors in a PhotographThere are two ways to create colors in a photograph.One method called additive,starts with three basic colors and adds them together to produce some other color. The second method,called subtractive,starts with white light(a mixture of all colors in the spectrum)and,by taking away some or all other colors,leaves the one desired.In the additive method,separate colored lights combine to produce various other colors.The three additive primary colors are green,red and blue(each providing about one-third of the wavelengths in the total spectrum).Mixed in varying proportions,they can produce all colors.Green and red light mix to produce yellow,red and blue light mix to produce magenta(a purplish pink);green and blue mix to produce cyan(a bluish green).When equal parts of all three of these primary-colored beams of light overlap（重叠）,the mixture appears white to the eye.In the subtractive process colors are produced when dye（染料）absorbs some wavelengths and so passes on only part of the spectrum.The subtractive primaries are cyan,magenta and yellow; these primaries or dyes absorb red,green and blue wavelengths respectively,thus subtracting them from white light. These dye colors are the complementary colors to the three additive primaries of red,green and blue.Properly combined,the subtractive primaries can absorb all colors of light, producing black.But,mixed in varying proportions,they too can produce any color in the spectrum.Whether a particular color is obtained by adding colored lights together or by subtracting some light from the total spectrum,the result looks the same to the eye.The additive process was employed for early color photography. But the subtractive method,while requiring complex chemical techniques,has turned out to be more practical and is the basis of all modern color films.It can be inferred from the passage that white can be produced by______.A:mixing different proportions of magenta,green and redB:mixing equal proportions of green,red and blueC:mixing different proportions of cyan, yellow and blueD:mixing equal proportions of black,red and green
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A recently ordered server came standard with one 3.0GHz processor. It is capable of handling fourtotal processors. Which of the following processor combinations can be used in this server？（）A、 One， two， three or four processorsB、 One， two， or three processorsC、 One， three， or four processorsD、 One， two or four processors
考题
单选题When a buoy marks a channel bifurcation，the preferred channel is NOT indicated by（）.A
the shape of an unlighted buoyB
the light color of a lighted buoyC
the color of the topmost bandD
whether the number is odd or even
考题
单选题At 1920，the buoy forward of your starboard beam is（）.A
an interrupted quick flashing buoyB
Hog Island Lighted Bell BuoyC
South Light BuoyD
Sand Shoal Inlet Lighted Buoy A
考题
单选题Aids to navigation marking the intracoastal waterway can be identified by（）.A
the letters ICW after the aid's number or letterB
yellow stripes，squares，or triangles marked on themC
white retroreflective materialD
the light characteristic and color for lighted aids
考题
单选题Mariners should ensure correct（）of aids to navigation during twilight periods when some lighted aids to navigation are lit while others are not.A
identificationB
distinctionC
discriminationD
clearly seeing
考题
单选题A lighted preferred-channel buoy may show a（）.A
fixed red lightB
Morse (A) white lightC
composite group-flashing lightD
yellow light
考题
单选题What is the light characteristic of a lighted，preferred-channel buoy? （）A
Group flashingB
Composite group flashingC
Interrupted quick flashingD
Fixed and flashing
考题
单选题A mid-channel buoy，if lighted，will show a（）.A
fixed red lightB
Morse (A) white lightC
green lightD
flashing red light
考题
单选题What is the accepted standard for wire rope falls used in connection with the lifeboat gear?（）A
Six by seven galvanized wire ropeB
Six by twenty-four improved plow steel wire ropeC
Six by thirty-seven preformed fiber-core wire ropeD
Six by nineteen regular-lay filler wire rope
考题
单选题Some lights used as aids to marine navigation have a red sector to indicate a danger area. The limits of a colored sector of a light are listed in the Light List in which of the following manners?（）A
Geographical positions outlining the area of the sectorB
True bearings as observed from the ship toward the lightC
An outline of the area of the sectorD
True bearings as observed from the light toward the ship
考题
单选题All of the following information concerning lighted aids to navigation may be read directly from the Light List EXCEPT the（）.A
locationB
height of light above waterC
luminous rangeD
light characteristics
考题
单选题The time required for a lighted aid to complete a full cycle of light changes is listed in the Light List as the（）.A
SetB
FrequencyC
PeriodD
Function
考题
单选题A recently ordered server came standard with one 3.0GHz processor. It is capable of handling fourtotal processors. Which of the following processor combinations can be used in this server？（）A
One， two， three or four processorsB
One， two， or three processorsC
One， three， or four processorsD
One， two or four processors
考题
单选题Lighted white and orange buoys must show which color light?（）A
OrangeB
WhiteC
RedD
Alternating yellow and white
考题
单选题What is the minimum standard for making an eye splice in a wire to be used as cargo gear（）．A
Make three tucks with full strands，remove half the wires from each strand，and make two more tucksB
Make four tucks in each strand，cut away every other strand，and make two more tucks with each remaining strandC
Make four tucks with each full strandD
Make six tucks with each strand，removing a few wires from each strand as each additional tuck is made
考题
单选题A special mark (yellow buoy)，if lighted，may exhibit which light rhythm?（）A
FlashingB
Morse AC
Equal intervalD
Occulting
考题
单选题The Light List shows a lighted aid to navigation on the left bank. This means that the light can be seen on the starboard side of a vessel（）.A
ascending the riverB
descending the riverC
crossing the riverD
proceeding towards sea
考题
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
考题
单选题A light used to signal passing intentions must be an （）.A
all-round yellow light onlyB
all-round white light onlyC
all-round blue light onlyD
alternating red and yellow light
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