单项选择题
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
单项选择题 When does auxiliary burner of incinerator put into operation? （） Ⅰ. start incinerator when it is cold Ⅱ. the sludge for dealing with is little Ⅲ. the sludge for dealing with is large Ⅳ. the water and impurity in sludge are too much Ⅴ. the temperature in incinerator is low Ⅵ. dealing with little solid rubbish
单项选择题 If separating effect is not good, which measure should be taken （）
单项选择题 Engine parameters shall be corresponded to NOx Technical Files. This is required by （）