單項選擇題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


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1.單項選擇題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

2.單項選擇題Disinfector in the sewage biological treatment plant usually is （）

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

3.單項選擇題Before marine sewage treatment plant works （） should be filled with fresh water.

A.deposition chamber
B.oxidation pool
C.disinfection chamber
D.all chamber

5.單項選擇題When the incinerator is stopped, which of the following is wrong?（）

A.After stopping supplying sludge oil, the value and pipe should be flushed by flushed by diesel oil and the incinerator continue burning for 10 minutes
B.Close auxiliary burner firstly and then close main burner
C.After stopping fuel, restoring the position of main fuel supply valve
D.Stop blower as soon as stopping supplying fuel oil