更多"A number of biological sewage treat"的相关试题:
[单项选择]Most marine biological sewage treatment plants consist of all the following statements except （）.
A. aeration tanks
B. settling tanks
C. disinfection agent
D. anaerobic bacteria
[单项选择]A number of biological sewage treatments plants are in use at sea but nearly all work on the principle called （）
A. deoxygenating
B. extended aeration
C. oxygenating
D. bubbling air
[单项选择]Disinfector in the sewage biological treatment plant usually is （）
A. chlorine water
B. ozone
C. hypo-calcium chloride
D. calcium oxide
[单项选择]The basic process of biological sewage treatment consists of the liquor either by bubbling air through it or by agitating the surface（）
A. oxygenating
B. oxidizing
C. deoxygenating
D. proportioning
[单项选择]Concerning the management of sewage treatment plant using activated sludge, which of the following is correct?（）
A. the plant should be prohibited to supplying air
B. the plant should work at intervals
C. the plant should be added disinfector in time
D. we should check strength of activated sludge, ivory-white color is best
[单项选择]Before marine sewage treatment plant works （） should be filled with fresh water.
A. deposition chamber
B. oxidation pool
C. disinfection chamber
D. all chamber
[单项选择]In sewage treatment, the term maceration refers to the process of （）
A. breaking up solid matter into fine particles
B. precipitating non-decomposed waste in a collection tank
C. chemically adjusting the sewage ph to 7-0
D. eliminating bacterium coli from the sewage
[单项选择]The International Sewage Pollution Prevention Certificate (ISPP) is issued to （）
A. ships of above 200 GT to MARPOL
B. every ship of 400 GT and above
C. all ships
D. ships of more than 200 GT but less 400 GT
[单项选择]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
[单项选择]（）are used to digest the sewage to produce innocuous sludge in a biological sewage treatment plant.
A. anaerobic bacteria
B. aerobic bacteria
C. air bubbles
D. disinfection chemicals
[单项选择]These plants are rather difficult（）
A. to look after
B. to be looked after
C. being looked after
D. looking after
[单项选择]Typical marine propulsion plants include（） directly coupled to the vessel’s single large-diameter, fixed-pitch propeller.
A. a single, long-stroke, slow-speed, turbocharged, two-stroke diesel engine
B. a single, long-stroke, medium-speed, turbocharged, four-stroke diesel engine
C. two medium-speed, turbocharged, four-stroke diesel engines
D. a variable-speed AC generator
[单项选择]Very few plants will（）without water.
A. flourish
B. fade
C. stem
D. cultivate
[单项选择]Fertilizer will（）the growth of these tomato plants.
A. accomplish
B. accelerate
C. accumulate
D. account
[单项选择]Cargo on deck，plants and live animals are usually received，handled，carried，kept and discharged at（）.
A. Carrier’s risk
B. Owner’s risk
C. Merchant's risk
D. Charterer’s risk
[单项选择]Treatment of frostbite includes（）.
A. rubbing affected area with ice or snow
B. rubbing affected area briskly to restore circulation
C. wrapping area tightly in warm cloths
D. warming exposed parts rapidly
