更多"Before marine sewage treatment plan"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]The desirable properties of a marine fuel oil should include（）
A. high flash point and high viscosity
B. low flash point and high viscosity
C. low heating value and high sulphur content
D. high heating value and low sulphur content
[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]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]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]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]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]（）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]Large marine diesel engines of crosshead construction generally have two systems of lubrication: a total loss system feeding the （） and a recirculation system lubricating the running gear and cooling the piston.
A. cylinder liners and piston rings
B. main bearings
C. crankpin bearings
D. turboblower
[单项选择]Turbocharging of marine diesel engine is achieved by two distinct methods, （） termed the constant pressure and the pulse system.
A. respectable
B. respectful
C. respective
D. respectively
[单项选择]Modern marine diesel engines equipped with mechanical fuel injection operate on a combustion phase within the cycle which is（）
A. entirely constant pressure
B. entirely constant temperature
C. a combination of constant volume and constant pressure
D. a combination of constant temperature and constant pressure
[单项选择]Modern marine diesel engines using mechanical fuel injection, operate on a combustion cycle which is（）
A. a combination of constant volume and constant pressure
B. a combination of constant temperature and constant pressure
C. entirely constant pressure
D. entirely constant volume
[单项选择]Grinding to eliminate shallow surface defects should be done（）.
A. parallel to the longitudinal direction of the chain
B. perpendicular to the direction of the anchor chain
C. diagonally across the link of the anchor chain
D. around the circumference of the chain link
[单项选择]A marine chemist issues gas free certificates and is certified by the（）.
A. Mine Safety Appliance Association
B. American Chemical Society
C. Marine Chemists Association
D. National Fire Protection Association
