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单选题
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
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单选题When separating fuel oil in oil separator, the separating quantity is（） of the real quantity.A
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单选题When oil is accidentally discharged into the water，what should you do after reporting the discharge（）.A
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