Before the oily water separator put into operation, it should be （）<br>A:filled with bilge water<br>B:filled with oil<br>C:filled with clean water<br>D:be emptied

Before the oily water separator put into operation, it should be （）
A:filled with bilge water
B:filled with oil
C:filled with clean water
D:be emptied

出自：海船船员证

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