名词解释题Salinity
名词解释题
Salinity
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解析：
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相关考题：
The fuel supply system to an automatic auxiliary boiler, will be automatically shutdown if the boiler() A.salinity is abnormallyB.high steam demand is tooC.feed-water flow is lowD.water level is abnormally low
Which of the listed problems could produce a high absolute pressure within a flash type evaporator?A.production of high salinity distillateB.seawater feed temperature below 165℃C.a leak in the first stage demisterD.a cracked distillate pump vent line
请阅读短文，完成此题。When we analyze the salt salinity(盐溶度 ) of ocean waters, we find that it varies only slightly from place to place. Nevertheless, some of these small changes are important. There are three basic processes that cause a change in oceanic salinity. One of these is the subtraction of water from the ocean by means of evaporation. In this manner, the salinity is increased, since the salt stays behind. If this is carried to the extreme, of course, white salt would be left behind; this, by the way, is how much of the table salt we use is actually obtained.The opposite of evaporation is precipitation, such as rain, by which water is added to the ocean. Here the ocean is being diluted so that the salinity is decreased. This may occur in areas ofhigh rainfall or in coastal regions where rivers flow into the ocean. Thus salinity may be increased by the subtraction of water by-evaporation, or decreased by the addition of fresh water by precipitation.Normally, in hot regions where the sun is very strong, the ocean salinity is somewhat higher than it is in other parts of the world where there is not as much evaporation. Similarly, in coastal regions where rivers dilute the sea, salinity is somewhat lower than in other oceanic areas.A third process by which salinity may be altered is associated with the formation and melting of sea ice. When seawater is frozen, the dissolved materials are left behind. In this manner, seawater directly beneath freshly formed sea ice has a higher salinity than it did before the ice appeared. Of course, when this ice melts, it will tend to decrease the salinity of the surrounding water.In the Weddell Sea, the densest water in the ocean is formed as a result of this freezing process, which increases the salinity of cold water. This heavy water sinks and is found in the deeper portion of the oceans of the world.The purpose of mentioning the Weddell Sea is__________.查看材料A．to give an example of cold-water salinityB．to point out the location of deep watersC．to make a comparison between hot-water salinity and cold-water salinityD．to show that the water in the Weddell Sea varies in salinity from place to place
请阅读短文，完成此题。When we analyze the salt salinity(盐溶度 ) of ocean waters, we find that it varies only slightly from place to place. Nevertheless, some of these small changes are important. There are three basic processes that cause a change in oceanic salinity. One of these is the subtraction of water from the ocean by means of evaporation. In this manner, the salinity is increased, since the salt stays behind. If this is carried to the extreme, of course, white salt would be left behind; this, by the way, is how much of the table salt we use is actually obtained.The opposite of evaporation is precipitation, such as rain, by which water is added to the ocean. Here the ocean is being diluted so that the salinity is decreased. This may occur in areas ofhigh rainfall or in coastal regions where rivers flow into the ocean. Thus salinity may be increased by the subtraction of water by-evaporation, or decreased by the addition of fresh water by precipitation.Normally, in hot regions where the sun is very strong, the ocean salinity is somewhat higher than it is in other parts of the world where there is not as much evaporation. Similarly, in coastal regions where rivers dilute the sea, salinity is somewhat lower than in other oceanic areas.A third process by which salinity may be altered is associated with the formation and melting of sea ice. When seawater is frozen, the dissolved materials are left behind. In this manner, seawater directly beneath freshly formed sea ice has a higher salinity than it did before the ice appeared. Of course, when this ice melts, it will tend to decrease the salinity of the surrounding water.In the Weddell Sea, the densest water in the ocean is formed as a result of this freezing process, which increases the salinity of cold water. This heavy water sinks and is found in the deeper portion of the oceans of the world.Which of the following is not the cause of the decrease in the oceanic salinity?查看材料A．Precipitation.B．Rain and snow.C．Formation of ice.D．Addition of water by rivers.
请阅读短文，完成此题。When we analyze the salt salinity(盐溶度 ) of ocean waters, we find that it varies only slightly from place to place. Nevertheless, some of these small changes are important. There are three basic processes that cause a change in oceanic salinity. One of these is the subtraction of water from the ocean by means of evaporation. In this manner, the salinity is increased, since the salt stays behind. If this is carried to the extreme, of course, white salt would be left behind; this, by the way, is how much of the table salt we use is actually obtained.The opposite of evaporation is precipitation, such as rain, by which water is added to the ocean. Here the ocean is being diluted so that the salinity is decreased. This may occur in areas ofhigh rainfall or in coastal regions where rivers flow into the ocean. Thus salinity may be increased by the subtraction of water by-evaporation, or decreased by the addition of fresh water by precipitation.Normally, in hot regions where the sun is very strong, the ocean salinity is somewhat higher than it is in other parts of the world where there is not as much evaporation. Similarly, in coastal regions where rivers dilute the sea, salinity is somewhat lower than in other oceanic areas.A third process by which salinity may be altered is associated with the formation and melting of sea ice. When seawater is frozen, the dissolved materials are left behind. In this manner, seawater directly beneath freshly formed sea ice has a higher salinity than it did before the ice appeared. Of course, when this ice melts, it will tend to decrease the salinity of the surrounding water.In the Weddell Sea, the densest water in the ocean is formed as a result of this freezing process, which increases the salinity of cold water. This heavy water sinks and is found in the deeper portion of the oceans of the world.Which of the following statements is TRUE according to the passage?查看材料A．Oceanic salinity has great effect on sea life.B．Many factors combine to cause changes in oceanic salinity.C．The movement of the water is related to the amount of salt.D．The temperature of the water has much to do with the oceanic salinity.
请阅读短文，完成此题。When we analyze the salt salinity(盐溶度 ) of ocean waters, we find that it varies only slightly from place to place. Nevertheless, some of these small changes are important. There are three basic processes that cause a change in oceanic salinity. One of these is the subtraction of water from the ocean by means of evaporation. In this manner, the salinity is increased, since the salt stays behind. If this is carried to the extreme, of course, white salt would be left behind; this, by the way, is how much of the table salt we use is actually obtained.The opposite of evaporation is precipitation, such as rain, by which water is added to the ocean. Here the ocean is being diluted so that the salinity is decreased. This may occur in areas ofhigh rainfall or in coastal regions where rivers flow into the ocean. Thus salinity may be increased by the subtraction of water by-evaporation, or decreased by the addition of fresh water by precipitation.Normally, in hot regions where the sun is very strong, the ocean salinity is somewhat higher than it is in other parts of the world where there is not as much evaporation. Similarly, in coastal regions where rivers dilute the sea, salinity is somewhat lower than in other oceanic areas.A third process by which salinity may be altered is associated with the formation and melting of sea ice. When seawater is frozen, the dissolved materials are left behind. In this manner, seawater directly beneath freshly formed sea ice has a higher salinity than it did before the ice appeared. Of course, when this ice melts, it will tend to decrease the salinity of the surrounding water.In the Weddell Sea, the densest water in the ocean is formed as a result of this freezing process, which increases the salinity of cold water. This heavy water sinks and is found in the deeper portion of the oceans of the world.This passage mainly tells us about__________.查看材料A．the analysis of the salinity of ocean watersB．the causes of the variation in oceanic salinityC．the importance of the changes in oceanic salinityD．the different forms of salts in ocean waters
When we analyze the salt salinity (盐浓度) of ocean waters, we find that it varies only slightly from place to place． Nevertheless, some of these small changes are important． There are three basic processes that cause a change in oceanic salinity． One of these is the subtraction of water from the ocean by means of evaporation． In this manner, the salinity is increased, since the salt stays behind． If this is carried to the extreme, of course, white salt would be left behind ; this, by the way,is how much of the table salt we use is actually obtained． The opposite of evaporation is precipitation, such as rain, by which water is added to the ocean． Here the ocean is being diluted so that the salinity is decreased． This may occur in areas of high rainfall or in coastal regions where rivers flow into the ocean． Thus salinity may be increased by the subtraction of water by evaporation, or decreased by the addition of fresh water by precipitation． Normally, in hot regions where the sun is very strong, the ocean salinity is somewhat higher than it is in other parts of the world where there is not as much evaporation． similarly, in coastal． Grandma, who used to live upstairs, is now the voice on long distance, and the working parent is far too beaten down each day to spend evening relaxation time listening to the sandbox experience of an eager four-year-old． So family conversation is as extinct as my old toys and parental questions such as "What have you been doing, Bobby? " have been replaced by "I 'm busy, go watch television． And watch TV they do; count them by the millions． But it's usually not children's television that children watch． Saturday morning, the children's hour, amounts to only about 8 percent of their weekly viewing． Where are they to be found?Watching adult television, of course, from the Match Game in the morning, to the afternoon at General Hospital, from the muggings and battles on the evening news right through the family hour and past into Starsky and Hutch． That's where you find our kids, over five million of them, at 10 p．m．, not fewer than a million until after midnight! All of this is done with parental permission． Television, used well, can provide enriching experiences for our young people, but we must use it with some sense． When the carpet is clean, we turn off the vacuum cleaner． When the dishes are clean, the dishwasher turns itself off． Not so the television, which is on from the sun in the morning to the moon at night and beyond! Parents must exercise some control and show some concern about the cultural influence on the child when a program not intended for that child is viewed． Parents need to intervene． Nonintervention may be a wise policy in international affairs, but the results of parental nonintervention will not be wise at alL． From the first two paragraphs one may infer that the writer's attitude towards "the old days" is ______A. preferringB. hatingC. being tired ofD. disappointing
It can be known from the passage that increase in the salinity of ocean water is caused by___________.A.melting of sea iceB.precipitationC.evaporationD.supplement of salt
When we analyze the salt salinity (盐浓度) of ocean waters, we find that it varies only slightly from place to place． Nevertheless, some of these small changes are important． There are three basic processes that cause a change in oceanic salinity． One of these is the subtraction of water from the ocean by means of evaporation． In this manner, the salinity is increased, since the salt stays behind． If this is carried to the extreme, of course, white salt would be left behind ; this, by the way,is how much of the table salt we use is actually obtained． The opposite of evaporation is precipitation, such as rain, by which water is added to the ocean． Here the ocean is being diluted so that the salinity is decreased． This may occur in areas of high rainfall or in coastal regions where rivers flow into the ocean． Thus salinity may be increased by the subtraction of water by evaporation, or decreased by the addition of fresh water by precipitation． Normally, in hot regions where the sun is very strong, the ocean salinity is somewhat higher than it is in other parts of the world where there is not as much evaporation． similarly, in coastal． Grandma, who used to live upstairs, is now the voice on long distance, and the working parent is far too beaten down each day to spend evening relaxation time listening to the sandbox experience of an eager four-year-old． So family conversation is as extinct as my old toys and parental questions such as "What have you been doing, Bobby? " have been replaced by "I 'm busy, go watch television． And watch TV they do; count them by the millions． But it's usually not children's television that children watch． Saturday morning, the children's hour, amounts to only about 8 percent of their weekly viewing． Where are they to be found?Watching adult television, of course, from the Match Game in the morning, to the afternoon at General Hospital, from the muggings and battles on the evening news right through the family hour and past into Starsky and Hutch． That's where you find our kids, over five million of them, at 10 p．m．, not fewer than a million until after midnight! All of this is done with parental permission． Television, used well, can provide enriching experiences for our young people, but we must use it with some sense． When the carpet is clean, we turn off the vacuum cleaner． When the dishes are clean, the dishwasher turns itself off． Not so the television, which is on from the sun in the morning to the moon at night and beyond! Parents must exercise some control and show some concern about the cultural influence on the child when a program not intended for that child is viewed． Parents need to intervene． Nonintervention may be a wise policy in international affairs, but the results of parental nonintervention will not be wise at alL． What is the main idea of the last paragraph?A. Parental nonintervention will not be praised．B. Nonintervention may be a good policy in international affairs．C. Parents must exercise some control and show some concern about the cultural influence on the children．D. Parents need to intervene．
Which of the following statements is TRUE according to the passage?___________A.Oceanic salinity has great effect on sea lifeB.Many factors combine to cause changes in oceanic salinityC.The movement of the water is related to the amount of saltD.The temperature of the water has much to do with the oceanic salinity
The purpose of mentioning the Weddell Sea is___________.A.to give an example of cold-water salinityB.to point out the location of deep watersC.to make a comparison between hot-water salinity and cold-water salinityD.to show that the water in the Weddell Sea varies in salinity from place to place
Which of the following is not the cause of the decrease in the oceanic salinity?___________A.PrecipitationB.Rain and snowC.Formation of iceD.Addition of water by rivers
共用题干Explore JordanWadi Rum is the name given to a valley cut into the sandstone and hard rock in southwest Jordan.______(46)The name Rum most likely comes from an Aramaic word meaning"high" or"elevated".The area around Wadi Rum is now also one of Jordan's most important tourist des-tinations, and attracts an increasing number of foreign tourists, particularly trekkers（越野者）, but also for camel safaris（旅行）or simply day-trippers from Aqaba or Petra. In contrast,there are almost no local or Arab tourists through nearby disi attracts young people from Amman at the weekends.Popular activities in the desert environment include camping under the stars,riding Arab horses,and rock-climbing amongst the massive rock formations. Jebal Rum(Jebal means moun- tain)is 1,574 meters above sea level.______(47)But Jordan is not simply a desert environment-it also contains the area which is the lowest point to the face of the Earth-the incredible Dead Sea,popular with tourists for swimming. ______(48)Once the waters reach the Dead Sea they are landlocked and have nowhere to go,so they evaporate,leaving behind a dense,rich cocktail（混合的）of salts and minerals that sup-ply industry,agriculture and medicine with some of its finest products. Once again,tourists bene- fit and can participate in water spa treatments and water therapies.The Dead Sea is located in the syro-African Rift,a 4,000-mile fault line in the Earth's crust. The lowest point of dry land on Earth is the shoreline of the Dead Sea at 1,300 feet below sea level. Because the lake is at the lowest point,this means that water does not drain from it. ______(49)Figures for the Dead Sea's salinity（盐度）today range from 25% to 35%.But the greatest tourist attraction is the incredible city of Petra.______(50)It is a vast unique city,carved into the sheer rock face by the Nabataeans,an industrious Arab people who settled here more than 2,000 years ago,turning it into an important junction for the silk,spice and other trade routes that linked China,India and southern Arabia with Egypt,Syria,Greece and Rome .Today,visitors can marvel at the architecture and explore life as it was thousands of years ago.______(47)A: It is the largest wadi(riverbed)in Jordan.B: It is the second highest peak in Jordan,rising directly above the Rum valley opposite Je-bal Urn Ishrin.C: This vast stretch of water receives a number of incoming rivers,including the River Jor-dan.D: The area has been used as a background setting in a number of films.E: Every day seven million tons of water evaporate from the lake,but the minerals remain causing the salt content to increase.F: It is without doubt Jordan's most valuable treasure.
单选题Which of the listed problems could produce a high absolute pressure within a flash type evaporator?（）AProduction of high salinity distillateBSeawater feed temperature below 165℃CA leak in the first stage demisterDA cracked distillate pump vent line
单选题The two most effective generating forces of surface ocean currents are（）.Atemperature and salinity differences in the waterBwind and density differences in the waterCwater depth and underwater topographyDrotation of the Earth and continental interference
单选题Which of the following statements is true concerning any evaporator?（）AHigh conductivity of the distillate indicates distillate salinity is excessiveBIncreasing the absolute pressure of the shell will increase the distillers capacityCMesh separators are used in evaporators to filter the distillateDReducing the brine density will reduce the heat lost overboard
单选题A salinity indicator is used to determine the （）.Acause of salt contaminationBlocation of salt water contaminationCchemical makeup of feed-waterDlevel of alkalinity in condensate
单选题The advantages of flash type evaporators, as compared to submerged tube type evaporators, include （）.Aless internal corrosion because of lower brine densityBhigher temperature evaporation for lower salinity of the distillate producedCless scale formation in a flash evaporatorDless feed-water required for a flash evaporator
单选题The procedures recommended for auxiliary boilers having high salinity include （）.Atreating with oxygen scavengersBsecuring the boiler and giving it a blowing downCincreasing the pHDreducing the phosphate level
单选题Algae vary in their capacity to tolerate salinity changes.Aindication Bability Ceffort Dintellect