單項選擇題One of the differences between a two-stroke engine and a four-stroke engine is,()

A.a two-stroke engine can’t work without cylinders
B.a two-stroke engine can’t work without pistons
C.a two-stroke engine can’t work without crankshafts
D.a two-stroke engine can’t work without a blower


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1.單項選擇題One of the differences between a two-stroke engine and a four-stroke engine is,()

A.a two-stroke engine works without exhaust operation
B.a two-stroke engine works without compression stroke
C.a two-stroke engine works without expansion stroke
D.a two-stroke engine works without suction operation

2.單項選擇題In a diesel engine,() works as working medium and changes the heat energy to mechanical energy, changes the reciprocating movement to rotary moment()

A.fuel spray; the burning of the fuel
B.the burned gas mixture; connecting rod
C.medium shaft;crankshaft
D.the burned gas mixture; piston rod

3.單項選擇題In a diesel engine, offers the heat energy directly(); works as working medium and changes the heat energy to mechanical energy()

A.the burning of the fuel; medium shaft
B.fuel spray; fresh air
C.fuel; fuel spray
D.the burning of the fuel; the burned gas mixture

5.單項選擇題Why a gearbox is needed in a ship driven by a medium-speed diesel engine?()

A.To reduce the main engine speed
B.To increase the main engine speed
C.To govern the main engine speed
D.To fix the propeller shaft