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细菌 bacteria
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In most people who breathe in TB bacteria and become infected, the body is able to fight the bacteria to stop them from growing. ()
此题为判断题(对，错)。
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When a person breathes in TB bacteria, the bacteria can settle in the stomach and begin to grow. ()
此题为判断题(对，错)。
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Tuberculosis is a disease caused by bacteria called Mycobacterium tuberculosis. ()
此题为判断题(对，错)。
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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
When anaerobic bacteria convert the sewage to an inert sludge, .A.no oxygen is neededB.oxygen is necessaryC.oxygen is given offD.no gas is produced
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填空题If the soil’s bacteria and other microorganisms are also eliminated, the rainforest is destroyed.____
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单选题When the mixture is used, it is important to ______.A
keep sugar and salt in waterB
drink it as often as necessaryC
take it as much as possibleD
use it to kill the bacteria
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单选题In order to culture and propagate enough bacteria to treat the body and galley wastes（）A
a new bacteria colony should be put into the plant in advanceB
the disinfection chemicals should be always usedC
the air blower should be started and keep running in advanceD
the nutrient for bacteria should put into plant in advance
考题
单选题When anaerobic bacteria convert the sewage to an inert sludge,（）A
no oxygen is neededB
oxygen is necessaryC
oxygen is given offD
no gas is produced
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Cooking is an effective way in preserving food because ______.A
cooking always kills the bacteria in foodB
cooking can make the food become dryC
the fire in cooking can kill bacteriaD
under the right conditions, cooking will kill bacteria
考题
单选题Many people are against the use of chemicals to preserve food because ______.A
chemicals are not necessary for preserving foodB
a small quantity of bacteria in food is good to peopleC
those chemicals that kill bacteria may not be good to peopleD
there are other better ways to preserve food
考题
名词解释题纤维分解菌 cellulose-decomposing bacteria
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