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
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相关考题
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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 -
单项选择题
The key feature of the Sulzer RT-flex system is that it gives complete freedom in the and operation of fuel injection and exhaust valve actuation（）
A.metering
B.control
C.using
D.timing -
单项选择题
A clearly visible beneath of RT-flex engines is their operation at all ship speedsThis is achieved by the superior combustion performance（）
A.shockless
B.smokeless
C.no vibration
D.noiseless
