单项选择题() are commonly used in mechanical-hydraulic governor(调速器) to sense engine speeds.

A.Bulbs
B.Bulks
C.Flyweights
D.Flywheels


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2.单项选择题“Stand by an engine” means ()

A.“prepare to stop the engine”
B. “assemble an engine on its bedplate”
C. “make an engine ready for starting”
D. “dismantle an engine”

3.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