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單項選擇題

The scavenge air receiver is of a simplified and modular design with integral non-return flaps, hanging cooler and two auxiliary air blowers（）

A.dozens
B.parcels
C.bundles
D.gallons

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單項選擇題

The piston crown employs the usual jet-shaker principle with an arrangement of cooling bores in the crown so that the surface temperatures of the crown are moderate with a very even distribution（）

A.water cooling
B.oil cooling
C.air cooling
D.combined cooling

單項選擇題

The development goals for a large marine engine are many often interact and in some cases even with each other（）

A.conflict
B.accord
C.harmonize
D.struggle