Before dismantling the pipe, would you （）the oil retained in the hose with （）?<br>A:flash；fresh air<br>B:wash；fresh water<br>C:flush；compressed air<br>D:rush；diesel oil

Before dismantling the pipe, would you （）the oil retained in the hose with （）?
A:flash；fresh air
B:wash；fresh water
C:flush；compressed air
D:rush；diesel oil

出自：海船船员证

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