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单选题
A number of biological sewage treatment plants are in use at sea but nearly all work on what is called the extended aeration processBasically the consists of oxygenating the liquor by bubbling air through itAccording to the above two sentences, the word "this" means （）.
A
a sewage treatment plant
B
the extended aeration process
C
the liquor
D
the bubbling air
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更多 “单选题A number of biological sewage treatment plants are in use at sea but nearly all work on what is called the extended aeration processBasically the consists of oxygenating the liquor by bubbling air through itAccording to the above two sentences, the word "this" means （）.A a sewage treatment plantB the extended aeration processC the liquorD the bubbling air” 相关考题
考题
Theois designed with a primary combustion chamber for burning sludge oil and ／or solid waste, and two secondary combustion chambers for9ases.burning uncombusted exhaust
A.boilerB.separatorC.incineratorD.treatment lological sewage
考题
Most marine biological sewage treatment plants consist of all the following statements except()
A.aeration tanksB.settling tanksC.disinfection agent(消毒剂D.anaerobic bacteria(厌氧菌)
考题
The biological sewage treatment plant utilizes Oto completely break down the sewage into an acceptable substance for discharge－into anywaters
A.agitation functionB.bacteriaC.chemicaD.oxidizing function
考题
第三组：The sewage treatment system must be capable of discharging an effluent that comes within the limits of the tests. Sewage can be treated biologically so that it may be discharged with minimal damage to ecosystem. Biological treatment involves the use of living organisms to treat the sewage within the sewage treatment plant so the liquids and sludge discharged are within the standards specified.Biological treatment plants are usually built up as a module and consist of various sections.Waste matter collected from the ships sanitary appliances is led through a sanitary piping system to the treatment module. The solid matter is broken up by passing it through a screen or a series of revolving cutters. The broken up solid material, together with the waste liquid, passes into a tank containing bacteria which require oxygen and a nutrient to propagate. The nutrient is contained in the solid waste material, and oxygen is supplied by bubbling compressed air through the broken up waste. The propagated bacteria change the waste material into a sludge by aerobic digestion. The sludge is finally treated to kill the coliform. bacteria before it is passed overboard.When a biological sewage plant is started up, such as when activating a new ship or after cleaning out the tank, a pellet containing bacteria is introduced into the tank. It takes approximately one week for the bacteria to propagate and make the system fully effective. The choice of sanitary appliance cleaners requires extreme care, as many cleaners are toxic to the active bacteria. Once a biological sewage plant is made active it should not be shut down. If it is it will have to be reactivated again because the bacteria will die without a supply of nutrients and oxygen.Bacteria that require oxygen for their survival are referred to as aerobic. Aerobic bacteria are normally used in ships sewage treatment equipment. Other forms of bacteria that do not require oxygen are referred to as anaerobic. Anaerobic bacteria are used in shore based sewage treatment works where methane is obtained as a by-product for use as fuel.This passage is mainly aboutA.sewage treatment methodsB.the various sections of a sewage treatment plantsC.biological sewage treatment systemD.how the sewage treatment plants are started up
考题
Biological treatment may use __ to treat sewage (1)living organisms (2)chemicals (3)additivesA.(1)B.(2)C.(3)D.(1)(2)(3)
考题
Most marine biological sewage treatment plants consist of all the following statements except ______.A.aeration(通风) tanksB.settling tanksC.disinfection agent(消毒剂)D.anaerobic bacteria(厌氧菌)
考题
共用题干
Ecosystem1. The word “ecosystem” is short for ecological（生态的）system. An ecosystem is where living creatures expand within a given area. You can say that an ecosystem is the natural environment where biological organisms（生物）such as plants,animals and humans co-exist in this world. So naturally that includes you and me. Yes,we are all members of an ecosystem!2 .There are different kinds of ecosystems depending on the type of surface or environ-ment. Most are naturally made such as the ocean or lake and the desert or rainforest.Some are man-made or artificial to encourage co-habitation（同居）between living and non-living things in a monitored environment,such as a zoo or garden.3 .Plants make up the biggest group of biological creatures within an ecosystem,and that's because they are the natural food producers for everyone. Plants raised in the earth need air and collect sunlight to help them grow. When they grow,the plants and its fruits or flowers eventually become a source of food to animals,microorganisms（微生物）and even hu- mans,of course. Food is then converted to energy for the rest of us to function,and this hap-pens in a never-ending cycle until the living creatures die and break up back in the earth.4 .Ecosystems are the basis of survival for all living things.We depend on plants and ani-mals for food. In order for us to exist,we need to grow and care about other organisms. We also need to care for the non-living things within our environment like our air and water so we can continue living as a population. Since plants,animals and humans are all of various species（物种）,we all play a role in maintaining the ecosystem.5 .To preserve our ecosystems,we should stop using too much energy,which happens when we consume more than our share of resources. Humans should not disturb the natural habitat（栖息地）of plants and animals,and allow them to grow healthily for the cycle to con-tinue. Too many people in a habitat can mean displacement（搬迁）: imagine being thrown out of your home because there is no more space for everyone. Worse,overpopulation can also ru- in the environment and cause destruction of existing plants and animals.To protect our ecosystems we should not use more than______.A: our share of resourcesB: a biological creatureC: a given areaD: the maintenance of the ecosystemE: the source of foodF: various species
考题
根据下列内容，回答196-200题。
Water problems in the future will become more intense and more complex. Our increasingpopulation will tremendously increase urban wastes, primarily sewage. On the other hand, increas-ing demands for water will decrease substantially the amount of water available for diluting wastes.
Rapidly expanding industries which involve more and more complex chemical processes will pro-duce large volumes of liquid wastes, and many of these will contain chemicals which are poi-sonous. To feed our rapidly expanding population, agriculture will have to be intensified. This willinvolve ever-increasing quantities of agriculture chemicals. From this, it is apparent that drasticsteps must be taken immediately to develop corrective measures for the pollution problem.
There are two ways by which this pollution problem can be lessened. The first relates to thetreatment of wastes to decrease their pollution hazard. This involves the processing of solid wastesprior to disposal and the treatment of liquid wastes, or effluents, to permit the reuse of the wateror best reduce pollution upon final disposal.
A second approach is to develop an economic use for all or a part of the wastes. Farm manureis spread in fields as a nutrient or organic supplement. Effluents from sewage disposal plants areused in some areas both for irrigation and for the nutrients contained. Effluents from other process-ing plants may also be used as a supplemental source of water. Many industries, such as meat andpoultry processing plants,are currently converting former waste production into marketablebyproducts. Other industries have potential economic uses for their waste products.
The purpose of this passage is___________.A.to warn the reader of the dwindling water supply
B.to explain industrial uses of water
C.to acquaint the reader with water pollution problems
D.to demonstrate various measures to solve the pollution problem
考题
共用题干
“Salty” Rice Plant Boosts HarvestsBritish scientists are breeding a new generation of rice plants that will be able to grow in soil containing salt water. Their work may enable abandoned farms to become productive once more.Tim Flowers and Tony Yeo,from Sussex University's School of Biological Sciences,have spent several years researching how crops,such as rice,could be made to grow in water that has become salty.The pair have recently begun a three-year programme,funded by the Biotechnology and Biological Sciences Research Council,to establish which genes enable some plants to survive salty conditions. The aim is to breed this capability into crops,starting with rice.It is estimated that each year more than 10m hectares（公顷）of agricultural land are lost because salt gets into the soil and stunts（妨碍生长）plants. The problem is caused by several factors. In the tropics , mangroves（红树林）that create swamps（沼泽）and traditionally formed barriers to sea water have been cut down .In the Mediterranean,a series of droughts have caused the water table to drop,allowing sea water to seep（渗透）in. In Latin America , irrigation often causes problems when water is evaporated（蒸发）by the heat , leaving salt deposits behind.Excess salt then enters the plants and prevents them functioning normally.Heavy concentrations of minerals in the plants stop them drawing up the water they need to survive.To overcome these problems,Flowers and Yeo decided to breed rice plants that take in very little salt and store what they do absorb in cells that do not affect the plants' growth.They have started to breed these characteristics into a new rice crop,but it will take about eight harvests before the resulting seeds are ready to be considered for commercial use.Once the characteristics for surviving salty soil are known,Flowers and Yeo will try to breed the appropriate genes into all manners of crops and plants.Land that has been abandoned to na- ture will then be able to bloom again,providing much needed food in the poorer countries of the world. The attitude of the author towards the research project is______.A: positiveB: negativeC: suspiciousD: indifferent
考题
共用题干
“Salty” Rice Plant Boosts HarvestsBritish scientists are breeding a new generation of rice plants that will be able to grow in soil containing salt water. Their work may enable abandoned farms to become productive once more.Tim Flowers and Tony Yeo,from Sussex University's School of Biological Sciences,have spent several years researching how crops,such as rice,could be made to grow in water that has become salty.The pair have recently begun a three-year programme,funded by the Biotechnology and Biological Sciences Research Council,to establish which genes enable some plants to survive salty conditions. The aim is to breed this capability into crops,starting with rice.It is estimated that each year more than 10m hectares（公顷）of agricultural land are lost because salt gets into the soil and stunts（妨碍生长）plants. The problem is caused by several factors. In the tropics , mangroves（红树林）that create swamps（沼泽）and traditionally formed barriers to sea water have been cut down .In the Mediterranean,a series of droughts have caused the water table to drop,allowing sea water to seep（渗透）in. In Latin America , irrigation often causes problems when water is evaporated（蒸发）by the heat , leaving salt deposits behind.Excess salt then enters the plants and prevents them functioning normally.Heavy concentrations of minerals in the plants stop them drawing up the water they need to survive.To overcome these problems,Flowers and Yeo decided to breed rice plants that take in very little salt and store what they do absorb in cells that do not affect the plants' growth.They have started to breed these characteristics into a new rice crop,but it will take about eight harvests before the resulting seeds are ready to be considered for commercial use.Once the characteristics for surviving salty soil are known,Flowers and Yeo will try to breed the appropriate genes into all manners of crops and plants.Land that has been abandoned to na- ture will then be able to bloom again,providing much needed food in the poorer countries of the world. Flowers and Yeo have started a program______.A: to find ways to prevent water pollutionB: to identify genes that promote growth in salty soilC: to breed rice plants that taste saltyD: to find ways to remove excessive salt from soil
考题
What is the primary use of the IBM Configuration Options Guide （COG）？ （）A、IBM System x ServicePac part number look upB、Operating system and part number look upC、General server information and part number look upD、Software compatibility charts
考题
What does Cisco Unity Express use, by default, to select a voice-mail mail box?（）A、Last Called Number B、Last Redirect Number C、Original Called Number D、Original Redirect Number E、Forward Redirect Number
考题
The maximum number of routers per OSPF area typically depends on which three factors?（）A、the kind of OSPF areas being implementedB、the number of external LSAs in the networkC、the number of DRs and BDRs in the areasD、the number of virtual links in the areasE、how well the areas can be summarizedF、the use of LSA filters
考题
单选题A land ethic of course cannot prevent the conversion, management, and use of the resources of soil, waters, plants and animals.A
altercation B
alternation C
alteration D
allocation
考题
单选题Which of the following is NOT among the solutions to the lack of sewage water treatment plants?A
Cooperation with other organizations.B
Cooperation with the World Bank.C
Two projects about treatment plants for sewage waters in Vlore and Pogradec.D
To control the waste water discharged.
考题
单选题The basic process of biological sewage treatment consists of the liquor either by bubbling air through it or by agitating the surface（）A
oxygenatingB
oxidizingC
deoxygenatingD
proportioning
考题
单选题（）are used to digest the sewage to produce innocuous sludge in a biological sewage treatment plant.A
anaerobic bacteriaB
aerobic bacteriaC
air bubblesD
disinfection chemicals
考题
单选题Concerning the management of sewage treatment plant using activated sludge, which of the following is correct?（）A
the plant should be prohibited to supplying airB
the plant should work at intervalsC
the plant should be added disinfector in timeD
we should check strength of activated sludge, ivory-white color is best
考题
单选题Disinfector in the sewage biological treatment plant usually is （）A
chlorine waterB
ozoneC
hypo-calcium chlorideD
calcium oxide
考题
单选题Most marine biological sewage treatment plants consist of all the following statements except （）.A
aeration tanksB
settling tanksC
disinfection agentD
anaerobic bacteria
考题
单选题In sewage treatment, the term maceration refers to the process of （）A
breaking up solid matter into fine particlesB
precipitating non-decomposed waste in a collection tankC
chemically adjusting the sewage ph to 7-0D
eliminating bacterium coli from the sewage
考题
单选题What does Cisco Unity Express use, by default, to select a voice-mail mail box?（）A
Last Called Number B
Last Redirect Number C
Original Called Number D
Original Redirect Number E
Forward Redirect Number
考题
单选题A number of biological sewage treatments plants are in use at sea but nearly all work on the principle called （）A
deoxygenatingB
extended aerationC
oxygenatingD
bubbling air
考题
单选题Before marine sewage treatment plant works （） should be filled with fresh water.A
deposition chamberB
oxidation poolC
disinfection chamberD
all chamber
考题
单选题What happens if all CTI ports for the configured CTI Port Group are busy when a new call arrives?（）A
Caller will receive network busy treatment. B
Caller will receive ringing treatment. C
CallManager will forward the call to the directory number configured for forward-on busy for this CTI Route Point in CallManager. D
An exception is raised, but the call is accepted and processed. E
CallManager will forward the caller to the directory number configured in IPCC Express for overflow
考题
单选题What is the fourth paragraph of the passage mainly about?A
The ways to use solar power.B
The advantages of solar power.C
The places to build the solar power plants.D
The difficulties of putting solar power to use widely.
考题
单选题Plants use the carbon, along with sunlight, for growth, and （） oxygen into the atmosphere in a process known as photosynthesis.A
relieveB
relateC
releaseD
retain
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