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單項(xiàng)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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單項(xiàng)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

單項(xiàng)選擇題

（） are generally formed in the frame of the both in-line and Vee engines to give maintenance access to the crankshaft main and connecting rod large end bearing.

A.Doors
B.Aspirate gauzer
C.Coupling
D.Blind

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