单项选择题
A.oil suction line restriction
B.correct amount of coolant
C.cavitation erosion in the water jackets
D.clogged sea suction strainer
单项选择题 Loss of lubricating oil pressure to the main propulsion diesel engine will actuate a/an （）.
单项选择题 A viscous damper, as used on a marine diesel, is a sealed precision built device which dampens the torsional vibrations in the （）.
单项选择题 A diesel engine is operating at 1800 RPM and driving a propeller at 600 RPMWhat is the speed reduction ratio?（）