單項選擇題（） fuel oils （） lubricating oils require treatment before passing to the engine.

A.Both；and
B.Neither；nor
C.Either；or
D.Both；or


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1.單項選擇題（） device is provided to prevent starting air from being admitted to the cylinder before the reversing is completed.

A.An automatic
B.A transmission
C.A self-regulating
D.An interlocking

5.單項選擇題“Stand by an engine” means （）

A.“prepare to stop the engine”
B. “assemble an engine on its bedplate”
C. “make an engine ready for starting”
D. “dismantle an engine”