单项选择题
A.“prepare to stop the engine” B. “assemble an engine on its bedplate” C. “make an engine ready for starting” D. “dismantle an engine”
“Before disconnecting the oil pipe, would you flush the...
单项选择题“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
