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更多“Water separation can be achieved through the use of a water separator sub.”相关的问题
A.gravity separation
B.use of adsorbents
C.use of flocculents
D.use of chemical addition
A.interfacer
B.brim
C.periphery
D.center
Evaporated from the oceans, water vapor forms clouds, some of which are transported by wind over the continents. Condensation from the clouds provides the essential agent of continental erosion: rain. Precipitated onto the ground, the water trickles down to form. brooks, streams, and rivers, constituting what is called the hydrographic network. This immense polarized network channels the water toward a single receptacle: an ocean. Gravity dominates this entire step in the cycle because water tends to minimize its potential energy by running from high altitudes toward the reference point that is sea level.
The rate at which a molecule of water passes through the cycle is not random but is a measure of the relative size of the various reservoirs. If we define residence time as the average time for a water molecule to pass through one of the three reservoirs--atmosphere, continent, and ocean--we see that the times are very different. A water molecule stays, on an average, eleven days in the atmosphere, one hundred years on a continent and forty thousand years in the ocean. This last figure shows the importance of the ocean as the principal reservoir of the hydrosphere but also the rapidity of water transport on the continents.
A vast chemical separation process takes places during the flow of water over the continents. Soluble ions such as calcium, sodium, potassium, and some magnesium are dissolved and transported. Insoluble ions such as aluminum, iron, and silicon stay where they are and form. the thin, fertile skin of soil on which vegetation can grow. Sometimes soils are destroyed and transported mechanically during flooding. The erosion of the continents thus results from two closely linked and interdependent processes, chemical erosion and mechanical erosion. Their respective interactions and efficiency depend on different factors.
According to the passage, clouds are primarily formed by water ______.
A．precipitating onto the ground
B．changing from a solid to a liquid state
C．evaporating from the oceans
D．being carried by wind
A、difference in volatilities
B、selective crystallization of pure water
C、molecular size of solute
D、different in permeabilities through membrane
A high rate of separation between oil and water is favored by ______.
A.large size of oil globule(小球)
B.low temperature
C.high viscosity
D.high flow rate
Heinz has been making a wide range of food products for over 100 years and manufactures baby foods in North America, Europe and Australia for sale throughout the world. Guided by Chinese nutritionists, we have fortified this product to give your growing babies an excellent source of iron, zinc, calcium and vitamin. Heinz is the brand you can trust.
Mixing Directions: An ideal supplement for babies 8 months and over.
1. Wash the feeding utensils thoroughly and boil for 10 minutes.
2. To mix the cereal, use water that has been boiled for 5 minutes.
3. Mix 1 part of cereal with 2～3 part of pre-boiled lukewarm water (around 70℃), let it soak for 30 seconds and then stir for 30 seconds.
This product is pre-cooked by steam pressure process and needs no further cooking; otherwise thin consistency and separation will be caused. Store in cool and dry place.
Manufactured under trademark license from H.J. Heinz Company by Heinz-UFF Ltd., (U.S. China joint venture), in Yantang, Shahe, and Guangzhou, China.
Heinz Hi-Protein Nutritious Cereal
The quality product is made by【46】.
This quality product is ideal for【47】.
Further cooking will cause【48】.
The manufacture of this product is guided by【49】.
The trademark license is possessed by【50】.
A.STCW
B.COLREGS
C.TSS
D.ISPS
听力原文： To extinguish different kinds of fires, several types of fire extinguishers have been invented. They must be ready for immediate use when fire breaks out. Most portable kinds operate for less than a minute, so they are useful only on small fires. The law requires ships, trains, buses and planes to carry extinguishers.
Since fuel, oxygen and heat must be present in order for fire to exist, one or more of these things must be removed or reduced to extinguish a fire. If the heat is reduced by cooling the material below a certain temperature, the fire goes out. The cooling method is the most common way to put out a fire. Water is the best cooling material because it is low in cost and easy to get.
Another method of extinguishing fire is by cutting off the oxygen. This is usually done by covering the fire with sand, steam or some other things. A blanket may be used to cover a small fire.
A third method is called separation, which includes removing the fuel, or material easy to burn, from a fire, so that it can find no fuel.
The method that is used to put out a fire depends upon the type of fire. Fires have been grouped in three classes. Fires in wood, paper, cloth and the like are called Class A fires. These materials usually help keep the fire on. Such fires can be stopped most readily by cooling with water.
(30)
A．Separating the fire.
B．Reducing the heat.
C．Removing the fuel
D．Cutting off the oxygen.
A.the temperature
B.the viscosity
C.the gravity
D.the size
Evaporated from the oceans, water vapor forms clouds, some of which are transported by wind over the continents. Condensation from the clouds provides the essential agent of continental erosion: rain. Precipitated onto the ground, the water trickles down to form. brooks, streams, and rivers, constituting what is called the hydrographic network. This immense polarized network channels the water toward a single receptacle: an ocean. Gravity dominates this entire step in the cycle because water tends to minimize its potential energy by running from high altitudes toward the reference point that is sea level.
The rate at which a molecule of water passes through the cycle is not random but is a measure of the relative size of the various reservoirs. If we define residence time as the average time for a water molecule to pass through one of the three reservoirs--atmosphere, continent, and ocean--we see that the times are very different. A water molecule stays, on an average, eleven days in the atmosphere, one hundred years on a continent and forty thousand years in the ocean. This last figure shows the importance of the ocean as the principal reservoir of the hydrosphere but also the rapidity of water transport on the continents.
A vast chemical separation process takes places during the flow of water over the continents. Soluble ions such as calcium, sodium, potassium, and some magnesium are dissolved and transported. Insoluble ions such as aluminum, iron, and silicon stay where they are and form. the thin, fertile skin of soil on which vegetation can grow. Sometimes soils are destroyed and transported mechanically during flooding. The erosion of the continents thus results from two closely linked and interdependent processes, chemical erosion and mechanical erosion. Their respective interactions and efficiency depend on different factors.
According to the passage, clouds are primarily formed by water ______.
A．precipitating onto the ground
B．changing from a solid to a liquid state
C．evaporating from the oceans
D．being carried by wind
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