When finish work on the oil separator, you should（）firstly.<br>A:cut off the power<br>B:cut off the oil inlet<br>C:open guide water valve<br>D:close oil outlet value

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

出自：海船船员证

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