单项选择题
A.piston B.fuel injection pump C.crankshaft D.oil can
The （） engine is used for alternators and some times fo...
单项选择题The （） engine is used for alternators and some times for main propulsion with a gearbox to provide a propeller of between 90 to 120 rpm.
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
