更多"In sewage treatment, the term macer"的相关试题:
[单项选择]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
[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]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]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]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]The term flood current refers to that time when the water().
A. is flowing towards the land
B. is moving towards the ocean
C. level is not changing
D. level is rising because of heavy rains
[单项选择]Which term refers to a transverse curvature of the deck().
A. Deadrise
B. Camber
C. Freeboard
D. Flare
[单项选择]The term PROLONGED BLAST refers to().
A. a blast of from five to seven seconds' duration
B. a blast of from five to six seconds' duration
C. a blast of from four to six seconds' duration
D. a blast of from six to seven seconds' duration
[单项选择]The term lee side refers to the().
A. side of the vessel exposed to the wind
B. Side of the vessel sheltered from the wind
C. Port side
D. Starboard side
[单项选择]The term LEE SHORE refers to the().
A. shore on the lee side of the vessel
B. shore that is in the lee
C. western shore of the Lesser Antilles
D. shore in a harbor of refuge
[单项选择]The term () refers to one complete sequence of operations required to produce power in an engine.
A. diesel engine
B. stroke
C. cycle
D. compression ratio
[单项选择]The term BOLLARD PULL refers to a towing vessel’s().
A. propulsion horsepower available
B. pulling ability at cruise power
C. towing winch capability
D. pulling ability under static conditions
[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]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]()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