“Before disconnecting the oil pipe, would you flush the oil retained in the pipe?” asked the oil barge owner （）<br>A:by using of fresh water<br>B:with compressed air<br>C:by using of sea water<br>D:with chemical compound

“Before disconnecting the oil pipe, would you flush the oil retained in the pipe?” asked the oil barge owner （）
A:by using of fresh water
B:with compressed air
C:by using of sea water
D:with chemical compound

出自：海船船员证

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