单选题“Before disconnecting the oil pipe, would you flush the oil retained in the pipe?” asked the oil barge owner （）Aby using of fresh waterBwith compressed airCby using of sea waterDwith chemical compound
单选题
“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
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