單項(xiàng)選擇題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


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1.單項(xiàng)選擇題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

3.單項(xiàng)選擇題“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

4.單項(xiàng)選擇題Smaller engines can be made more rigid than large ones and may not have ().

A.through bolts
B.turbo-chargers
C.bed plates
D.columns

5.單項(xiàng)選擇題Smaller engines can be made more rigid than large ones and may not have ().

A.through bolts
B.dividing walls
C.sloping surfaces
D.relative angles