单项选择题
A.10% B.15% C.20% D.25%
The scavenge air receiver is of a simplified and modula...
单项选择题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
The piston crown employs the usual jet-shaker principle...
单项选择题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
The development goals for a large marine engine are man...
单项选择题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
