更多"（）are used to digest the sewage to "的相关试题:
[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]（） is used to produce electric power.
A. An alternator
B. fresh water generator
C. A compressor
D. A clarifier
[单项选择]Freon 12 which is used to produce intense cold is normally a （） when at atmospheric pressure and temperature.
A. liquid
B. gas
C. solid
D. water only
[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]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]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]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]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]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]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]Radar beacons are transmitters designed to produce a（）on the screens of ship’s radar sets.
A. incorrect image
B. distinctive image
C. pictorial image
D. pictographic image
[单项选择]Cumulonimbus clouds can produce（）.
A. dense fog and high humidity
B. gusty winds，thunder，rain or hail，and lightning
C. clear skies with the approach of a cold front
D. a rapid drop in barometric pressure followed by darkness
[单项选择]Why will a turbocharger diesel engine produce black smoke if excessive additional load is applied too quickly?（）
A. Exhaust energy would draw excess air
B. The inertia of the turbocharger rotor causes a time lag which delays the turbocharger speed increase
C. Exhaust gas pumping losses are increased due to turbine windage
D. Exhaust gas back pressure falls slightly due to increased nozzle action
[单项选择]Which of the listed problems could produce a high absolute pressure within a flash type evaporator?（）
A. Production of high salinity distillate
B. Seawater feed temperature below 165℃
C. A leak in the first stage demister
D. A cracked distillate pump vent line
[单项选择]The all-purpose nozzle will produce a fog spray when you（）.
A. pull the nozzle handle all the way back toward the operator
B. pull the nozzle handle back to a position where the handle is perpendicular to the plane of the nozzle
C. push the nozzle handle forward as far as it will go
D. insert a fog applicator between the fire hose and nozzle
