单选题Before dismantling the pipe, would you ()the oil retained in the hose with ()?Aflash;fresh airBwash;fresh waterCflush;compressed airDrush;diesel oil
单选题
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
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