單項(xiàng)選擇題The two-stroke cycle begins with the piston coming up from the bottom of its stroke, with scavenge ports in the sides of the cylinder being （）.

A.shut
B.closing
C.opened
D.closed


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1.單項(xiàng)選擇題The term medium speed diesel engine is currently taken to mean an engine with an operating rotational speed of （） rpm.

A.below 300
B.above 1200
C.between 300 to 1200
D.below 1200

2.單項(xiàng)選擇題The term （） refers to one complete sequence of operations required to produce power in an engine.

A.diesel engine
B.stroke
C.cycle
D.compression ratio

3.單項(xiàng)選擇題The supercharger takes air out of the surrounding atmosphere and then feeds it to the engine’s （）.

A.inlet valves
B.exhaust valves
C.emergency valves
D.run-return valves

4.單項(xiàng)選擇題The successful operation of any engine or machine and （） depend on effective lubrication.

A.their no trouble period
B.their freely trouble period
C.its free trouble life
D.its trouble-free life

5.單項(xiàng)選擇題The starting of a marine diesel engine is generally carried out with the assistance of （）.

A.compressed air
B.electricity
C.hydraulic oil
D.compressing air