单选题When anaerobic bacteria convert the sewage to an inert sludge,（）Ano oxygen is neededBoxygen is necessaryCoxygen is given offDno gas is produced
单选题
When anaerobic bacteria convert the sewage to an inert sludge,（）
A
no oxygen is needed
B
oxygen is necessary
C
oxygen is given off
D
no gas is produced
参考解析
解析：
暂无解析
相关考题：
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)。
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)
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
A user reports that they are getting an error when trying to save a video file to a share on a server running Windows Server 2003. The administrator looks at the file and finds that it is 5GB. The administrator checks the server and finds that the server has 100GB of free space. This file needs to be saved on the server.Which of the following should the administrator do to accomplish this?（）A. Convert the filesystem to EXT3.B. Convert the filesystem to VMFS.C. Convert the filesystem to NTFS.D. Convert the filesystem to FAT32.
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
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)
The deck water seal of the inert gas system ______．A.Cools the inert gas and prevents soot from entering the cargo tanksB.Acts as an emergency shutdown when inlet pressures exceed the safe working pressureC.Prevents the backflow of hydrocarbon gasses into nonhazardous areasD.Relieves sudden large overpressures in the system
The fresh air intake of the inert gas system ______，A.Prevents the flue gas from falling below 3% content of oxygenB.Allows the inert gas piping to be used for gas freeing the tanksC.Opens when there is excessive vacuum on the deck water sealD.Enables outside air to mix with and cool hot flue gasses
When a non-volatile cargo is carried in a tank that has not been previously gas freed，then that tank shall ______．A.be purged with hydrocarbon gas prior to loadingB.be gas-freed after loading operationsC.not be maintained in an inert conditionD.be maintained in an inert condition
When a tank is to be gas freed after washing，the concentration of hydrocarbon vapour should be reduced by purging the inerted cargo tank with ______．A.the oxygenB.the gasC.the inert gasD.the hydrocarbon vapour
Which statement about inert gas pressures in a cargo tank is TRUE ________．A.The pressures of the inert gas in the tank may create excessive pressure at the pump while dischargingB.Gas pressures should be maintained at the highest permissible level throughout the discharging processC.High gas pressures may cause pyrophoric oxidation in the tankD.High gas pressures may cause loss of suction when stripping
When the inert gas pressure is being ______ in the cargo tanks，particular attention should be paid to obtaining an oxygen concentration．A.topped upB.bracedC.tommed downD.shored
Which statement about the inert gas system is TRUE ________．A.Boiler soot blowers should never be used when the IG system is operatingB.The boiler will produce the best quality of flue gas for the IG system when the boiler load is very lightC.The boiler will produce the most quantity of flue gas for the IG system when the boiler load is very lightD.Flue gas with excessive oxygen content is de-oxygenated in the scrubber
When running a Windows server， which option is used with the ping command to convert numerical addresses to host names？（）A、 -rB、 -aC、 -vD、 -n
A user reports that they are getting an error when trying to save a video file to a share on a server running Windows Server 2003. The administrator looks at the file and finds that it is 5GB. The administrator checks the server and finds that the server has 100GB of free space. This file needs to be saved on the server. Which of the following should the administrator do to accomplish this?（）A、Convert the filesystem to EXT3.B、Convert the filesystem to VMFS.C、Convert the filesystem to NTFS.D、Convert the filesystem to FAT32.
When performing a database duplication， which duplicate database parameter would you set to ensure that the online redo logs are created in the correct location？（） A、 log_file_name_convertB、 convert_log_file_nameC、 file_name_convert_logD、 redo_log_file_name_convertE、 logfile_convert_directory
单选题The fresh air intake of the inert gas system（）.Aprevents the flue gas from falling below 3% content of oxygenBallows the inert gas piping to be used for gas freeing the tanksCopens when there is excessive vacuum on the deck water sealDenables outside air to mix with and cool hot flue gasses
单选题When running a Windows server， which option is used with the ping command to convert numerical addresses to host names？（）A-rB-aC-vD-n
单选题When the mixture is used, it is important to ______.Akeep sugar and salt in waterBdrink it as often as necessaryCtake it as much as possibleDuse it to kill the bacteria
单选题The deck water seal of the inert gas system（）.Acools the inert gas and prevents soot from entering the cargo tanksBacts as an emergency system shutdown when the inlet pressures exceed the safe working pressure in the hazardous zoneCprevents the backflow of hydrocarbon gasses into nonhazardous areasDrelieves sudden large overpressures in the system
单选题It is that reduce the BOD by converting the organic content of the sewage to a chemically and organically inert sludge（）Athe bacteriaBoxygenCoxidizing functionDagitation function
单选题Most marine biological sewage treatment plants consist of all the following statements except （）.Aaeration tanksBsettling tanksCdisinfection agentDanaerobic bacteria
单选题When performing a database duplication， which duplicate database parameter would you set to ensure that the online redo logs are created in the correct location？（）A log_file_name_convertB convert_log_file_nameC file_name_convert_logD redo_log_file_name_convertE logfile_convert_directory
单选题When running a Windows server， which option is used with the ping command to convert numerical addresses to host names？（）A -rB -aC -vD -n
单选题The deck water seal of the inert gas system（）.Acools the inert gas and prevents soot from entering the cargo tanksBacts as an emergency shutdown when inlet pressures exceed the safe working pressureCprevents the backflow of hydrocarbon gasses into nonhazardous areasDrelieves sudden large overpressures in the system