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What temperature is recommended for washing light colored clothes?____
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从文章中间部分“warm temperature for light colored clothes”可知，此处应填warm temperature。
从文章中间部分“warm temperature for light colored clothes”可知，此处应填warm temperature。
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What is NOT a requirement for the safe and effective use of a crude oil washing system ________．A.Strip all tanks and remove the bottom residueB.Use an inert gas system while washing tanksC.Use portable washing machines to reach areas obscured by structural members in the tanksD.Debottom the tank used as the source for the tank cleaning machines
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By regulation，cargo tanks must be inert before and during what operation?A.StrippingB.LoadingC.CleaningD.Crude oil washing
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共用题干
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.What does the passage mainly discuss?A: Recent developments in camera technology.B:How to make white light.C:The additive and subtractive methods of producing color.D:The discovery of the spectrum.
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共用题干
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共用题干
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单选题A large change in ambient temperature, or using an oil of a viscosity different from the one recommended by the manufacturer in a mechanical hydraulic governor, will result in the need to adjust the （）.A
pilot valve openingB
compensating needle valveC
compensating spring tensionD
accumulator spring tension
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单选题What is the phenomenon called where different wavelengths of light travel at different speeds？（）A
OSNRB
dispersionC
light skewD
attenuation
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单选题As you approach Giles Bend Cutoff Light (mile 367.7 LDB)，what type of daymark would you see on the light structure?（）A
Green diamondB
Green triangleC
Red diamondD
Red square
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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
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单选题By regulation，cargo tanks must be inert before and during what operation?（）.A
StrippingB
LoadingC
CleaningD
Crude oil washing
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单选题In terms of pressure and temperature in the refrigerant in the compressor, what happens to the primary?（）A
its pressure and temperature are both loweredB
its pressure and temperature are both raisedC
its pressure is lowered and its temperature is raisedD
its pressure is raised and its temperature is lowered
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单选题One result of operating a diesel engine at light load with excessively low cooling water temperature is a/an （）A
decrease in ignition lagB
increase in fuel economyC
reduction in lube oil viscosityD
increase in cylinder misfiring
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单选题On navigational aids，what does the light characteristic Fl(2+1) mean?（）A
A flashing light combined with a fixed light of greater brightnessB
Light flashes combined in groups，with a different number of flashes in each groupC
A light showing groups of two or more flashes at regular intervalsD
A fixed light varied at regular intervals by groups of two or more flashes of greater brightness
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单选题High cylinder firing pressure, accompanied by low exhaust temperature, can result from （）A
improper fuel rack positingB
lengthy exhaust valve durationC
extend operation at light loadD
excessively early injection timing
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单选题What does the speaker suggest buying?A
Some beautiful clothes.B
Some colored photographs.C
The guide book to the museum.
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单选题If a diesel engines exhaust temperature is abnormally high, the cause could be（）A
too light of a loadB
injection timing is too earlyC
overloading of the engineD
too low of a compression ratio
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单选题When summer comes and the light-colored people go to the beaches, ______.A
all of them will tan darklyB
few of them will tan -darklyC
many of them will not tan at allD
few of them will not tan at all
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