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?（）

A.030 to 1
B.300 to 1
C.333 to 1
D.330 to 1

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单项选择题

A.air in the cooling system
B.an overhauled water pump
C.correct amount of coolant
D.no air in the cooling system

单项选择题

A.camshaft
B.reduction gears
C.rocker arm
D.connecting or piston rod

单项选择题

A.a worn water pump
B.not enough coolant
C.air in the cooling system
D.all of the above