單項選擇題

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

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單項選擇題

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

單項選擇題

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