单项选择题
Combustion knock occurring in a diesel engine can be caused by （）.
A.excessive fuel penetration
B.prolonged injection lag
C.reduced ignition lag
D.prolonged ignition lag
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单项选择题
A thrust bearing is used with a propulsion diesel engine to （）.
A.control axial movement of the crankshaft
B.transmit engine thrust to the propeller shaft
C.absorb vibrations in the propeller shafting
D.prevent propeller thrust from being transmitted to the hul -
单项选择题
Control of the main propulsion diesel engines can be shifted from the engine room to the wheelhouse from the （）.
A.wheelhouse control station
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单项选择题
Combustion knock can occur in the cylinders of a diesel engine under any condition permitting （）.
A.a shortened ignition delay period
B.a lean fuel/air mixture
C.excess fuel in the combustion chamber
D.rapid vaporization of injected fuel droplets
