单项选择题
A.four-stroke B.two-stroke C.slow speed D.reversible
The （） of the main shaft should be measured with a （）.A...
单项选择题The （） of the main shaft should be measured with a （）.
A.clearance；calipers B.sinking；bridge gauge C.diameter；bridge gauge D.clearance；lead wire
Such an engine frame helps （） the engine and so protect...
单项选择题Such an engine frame helps （） the engine and so protect the bearings from the deformation forces transmitted via the ships double bottom.
A.to stiffen B.to soften C.to loosen D.to wear
“Stand by engine” means （）.A.prepare to stop the engine...
单项选择题“Stand by engine” means （）.
A.prepare to stop the engine B.assemble an engine on its bedplate C.make an engine ready for starting D.make an engine run steadily
