单项选择题()can not cause oil flow from water outlet of self-cleaning separator.

A.Oil temperature too high
B.Diameter of gravity disc too large
C.Oil temperature too low
D.High level tank out of water


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1.单项选择题()can cause oil flow from water outlet of a separator.

A.Oil inlet valve opening too quickly
B.Oil temperature too high
C.Diameter of gravity disc too small
D.Viscosity of oil too low

2.单项选择题When finish work on the oil separator, you should()firstly.

A.cut off the power
B.cut off the oil inlet
C.open guide water valve
D.close oil outlet value

4.单项选择题The separating effect of oil separator is not very good, the reason may be()

A.too little seal water
B.improper gravity disc
C.oil discharging pump not working very well
D.low water level of the working water

7.单项选择题One of the reasons that cause oil flowed from sludge outlet of a self-cleaning separator is()

A.seal water supply be cut off
B.make up water supply be cut off
C.oil outlet valve closed or not open sufficiently
D.the flow rate of oily water is too much

8.单项选择题When two oil separators are working in series, they should work with ()

A.both as clarifiers
B.first one as clarifiers, second one as purifier
C.both as purifiers
D.first one as purifier, second one as clarifier

9.单项选择题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

10.单项选择题Disinfector in the sewage biological treatment plant usually is ()

A.chlorine water
B.ozone
C.hypo-calcium chloride
D.calcium oxide